# tblRockTexture

RockTextureCom:
MOst definitions from the BGS Rock Classification system, but also from the Geological Society of London handbooks


RockTextureCom:
Having holes occupied by late-stage or post-magmatic minerals

RockTextureDesc:
Having holes occupied by late-stage or post-magmatic minerals

RockTextureRef:
BGS Research Report # RR 99-06 V1 Sec. 7.2.6


RockTextureCom:
Having round, ovoid or elongate irregular holes formed by gas expansion (bubbles)

RockTextureDesc:
Having round, ovoid or elongate irregular holes formed by gas expansion (bubbles)


RockTextureCom:
Having spheres consisting of concentric shells with hollow interspaces

RockTextureDesc:
Having spheres consisting of concentric shells with hollow interspaces


RockTextureCom:
Irregular shaped cavities (druses) in plutonic rx  into which euhedral crystals of the rock project

RockTextureDesc:
Irregular shaped cavities (druses) in plutonic rx  into which euhedral crystals of the rock project


RockTextureCom:
Degree to which formerly molten rock exhibits crystal development

RockTextureDesc:
Degree to which formerly molten rock exhibits crystal development


RockTextureRef:
BGS Research Report # RR 99-06 Sec. 7.2.2


RockTextureCom:
Interlocking arrangment of crystals arising from simultaneous crystallisation or exsolution

RockTextureDesc:
Interlocking arrangment of crystals arising from simultaneous crystallisation or exsolution


RockTextureCom:
Regular intergrowth of two minerals giving a cuniform or runic appearance

RockTextureDesc:
Regular intergrowth of two minerals giving a cuniform or runic appearance

RockTextureRef:
BGS Research Report # RR 99-06 V1 Sec. 7.2.4


RockTextureCom:
Variety of (micro)graphic intergrowth of qtz and alk feldspar crudely radiate and less regular

RockTextureDesc:
Variety of (micro)graphic intergrowth of qtz and alk feldspar crudely radiate and less regular


RockTextureCom:
Intergrowth of vermicular quartz and plagioclase feldspar

RockTextureDesc:
Intergrowth of vermicular quartz and plagioclase feldspar


RockTextureCom:
Textures/fabrics formed during partial to total rextallisation of rock under elevated P/T conditions

RockTextureDesc:
Textures/fabrics formed during partial to total rextallisation of rock under elevated P/T conditions


RockTextureCom:
Megascopically composite rock consist of meta-country & aplitic/granitic/pegmatitic (plutonic) parts

RockTextureDesc:
Megascopically composite rock consist of meta-country & aplitic/granitic/pegmatitic (plutonic) parts

RockTextureRef:
BGS Research Report # RR 99-02 V1 Sec. 9.3


RockTextureCom:
Migmatitic rock with  non-leucosome streaks in leucosome

RockTextureDesc:
Migmatitic rock with  non-leucosome streaks in leucosome


RockTextureCom:
Migmatitic rock with neosome and mesosome have a layered structure

RockTextureDesc:
Migmatitic rock with neosome and mesosome have a layered structure


RockTextureCom:
Migmatitic rock with ghost-like relicts of pre-existing rx within largely reconstituted igneous host

RockTextureDesc:
Migmatitic rock with ghost-like relicts of pre-existing rx within largely reconstituted igneous host


RockTextureCom:
Migmatitic rock where the neosome or leucosome forms a network of veins within mesosome

RockTextureDesc:
Migmatitic rock where the neosome or leucosome forms a network of veins within mesosome


RockTextureCom:
Inhomogeneous rock with coarse banding,+15mm and contrasting texture/grain size in adjacent bands

RockTextureDesc:
Inhomogeneous rock with coarse banding,+15mm and contrasting texture/grain size in adjacent bands

RockTextureRef:
BGS Research Report # RR 99-02 V1 Sec. 10.1


RockTextureCom:
Hard, fine-med grnd rx which lack parting planes & have rextallised due to contact metamorphism

RockTextureDesc:
Hard, fine-med grnd rx which lack parting planes & have rextallised due to contact metamorphism


RockTextureCom:
Stratigraphic or metamorphic layers of minerals and fossils >10mm thick and conitiguous

RockTextureCom2:
BHK does not think banded should be included

RockTextureDesc:
Stratigraphic or metamorphic layers of minerals and fossils >10mm thick and conitiguous


RockTextureCom:
Silky or lustrous sheen on foliation surfaces imparted by phyllosilicates (usually white mica)

RockTextureDesc:
Silky or lustrous sheen on foliation surfaces imparted by phyllosilicates (usually white mica)


RockTextureCom:
Planar textural/structural feature, in particular preferred orientation of inequidiamensional mins.

RockTextureDesc:
Planar textural/structural feature, in particular preferred orientation of inequidiamensional mins.


RockTextureCom:
Lineated structures usually due to preferred orientation of prismatic minerals

RockTextureDesc:
Lineated structures usually due to preferred orientation of prismatic minerals


RockTextureCom:
Noncohesive rock comprising mechanically disrupted rock fragments usually >64mm diameter

RockTextureDesc:
Noncohesive rock comprising mechanically disrupted rock fragments usually >64mm diameter

RockTextureRef:
BGS Research Report # RR 99-02 V2 Sec. 7.1


RockTextureCom:
Stong fissility yielding thin plates which are lithologically indistinguishable.  Syn-slaty cleavage

RockTextureDesc:
Stong fissility yielding thin plates which are lithologically indistinguishable.  Syn-slaty cleavage


RockTextureCom:
Large metamorphic crystals in finer-grained groundmass

RockTextureDesc:
Large metamorphic crystals in finer-grained groundmass


RockTextureCom:
Recognisable schistosity (foliation or lineation) which allows rock to be spilt easily along planes

RockTextureDesc:
Recognisable schistosity (foliation or lineation) which allows rock to be spilt easily along planes


RockTextureCom:
Extreme. fine grnd, foliated texture where 10-50% rock composed of dynamically recrystallised matrix

RockTextureDesc:
Extreme. fine grnd, foliated texture where 10-50% rock composed of dynamically recrystallised matrix


RockTextureCom:
Large crystal fragments (as opposed to lithic fragments)  in finer-grained matrix

RockTextureDesc:
Large crystal fragments (as opposed to lithic fragments)  in finer-grained matrix


RockTextureCom:
Rock consists of aggregate of broardly equidiamensional crystals/grains

RockTextureDesc:
Rock consists of aggregate of broardly equidiamensional crystals/grains


RockTextureCom:
Lacking obvious foliation, having granoblastic texture

RockTextureDesc:
Lacking obvious foliation, having granoblastic texture


RockTextureCom:
Lensoid crystals/mineral aggregates common in gneissose rocks where foliation wraps augen structure

RockTextureDesc:
Lensoid crystals/mineral aggregates common in gneissose rocks where foliation wraps augen structure


RockTextureCom:
Cohesive brecciated texture where 50-90% rock composed of comminuted matrix

RockTextureDesc:
Cohesive brecciated texture where 50-90% rock composed of comminuted matrix


RockTextureCom:
Specific variety of brecciated rx where the matrix forms <10% of rock

RockTextureDesc:
Specific variety of brecciated rx where the matrix forms <10% of rock


RockTextureCom:
Intensely foliated phyllosilicate-rich rocks (often associated with ductile shear zones)

RockTextureDesc:
Intensely foliated phyllosilicate-rich rocks (often associated with ductile shear zones)


RockTextureCom:
Minerals having a preferred crystalligraphic orientation

RockTextureDesc:
Minerals having a preferred crystalligraphic orientation


RockTextureCom:
Subparallel arrangement of tabluar or bladed crystals. Syn- trachytic/fluxion-textured

RockTextureDesc:
Subparallel arrangement of tabluar or bladed crystals. Syn- trachytic/fluxion-textured

RockTextureRef:
BGS Research Report # RR 99-06 V1 Sec. 7.2.5


RockTextureCom:
Orbs consisting of concentric shells of rhythmically alternating mineral constitution

RockTextureDesc:
Orbs consisting of concentric shells of rhythmically alternating mineral constitution


RockTextureCom:
Spheroidal bodies of radiating fibrous crystals in a glass or crystal matrix

RockTextureDesc:
Spheroidal bodies of radiating fibrous crystals in a glass or crystal matrix


RockTextureCom:
Sheafs of blade-like skeletal olivine and pyx in finer devitrified aggregate of pyx & chromite

RockTextureDesc:
Sheafs of blade-like skeletal olivine and pyx in finer devitrified aggregate of pyx & chromite


RockTextureCom:
Fan-like arrangement of divergent/branching fibres

RockTextureDesc:
Fan-like arrangement of divergent/branching fibres


RockTextureCom:
Textures in volcanoclastic fragments that have formed as direct result of volcanic activity

RockTextureDesc:
Textures in volcanoclastic fragments that have formed as direct result of volcanic activity

RockTextureRef:
BGS Research Report # RR 99-06 V1 Sec. 4.1


RockTextureCom:
Having a planar foliation formed by welding compaction, with elongation and flattening of fragments

RockTextureDesc:
Having a planar foliation formed by welding compaction, with elongation and flattening of fragments

RockTextureRef:
BGS Research Report # RR 99-06 V1 Sec. 7.2.7


RockTextureCom:
Extreme eutaxitic, having a linear fabric; elongate pumice fragments are termed "fiamme'

RockTextureDesc:
Extreme eutaxitic, having a linear fabric; elongate pumice fragments are termed "fiamme'


RockTextureCom:
Shards have sintered together during compaction or flow

RockTextureDesc:
Shards have sintered together during compaction or flow


RockTextureCom:
Rel. larger xtals (phenocrysts) embedded in finer ground mass (where mineral not used as qualifier)

RockTextureDesc:
Rel. larger xtals (phenocrysts) embedded in finer ground mass (where mineral not used as qualifier)

RockTextureRef:
BGS Research Report # RR 99-06 V1 Sec.7.2.3


RockTextureRef:
BGS Research Report # RR 99-06 V1 Sec. 7.2.3


RockTextureCom:
Continuous range of sizes of principal minerals

RockTextureDesc:
Continuous range of sizes of principal minerals


RockTextureCom:
Relatively larger crystals (phenocrysts) embedded in a finer ground mass

RockTextureDesc:
Relatively larger crystals (phenocrysts) embedded in a finer ground mass


RockTextureCom:
Textures formed by post-depositional biological, diagenetic and chemical weathering processes

RockTextureDesc:
Textures formed by post-depositional biological, diagenetic and chemical weathering processes


RockTextureRef:
BGS Research Report # RR 99-03 V3 Sec. 13.5.1


RockTextureRef:
BGS Research Report # RR 99-03 V3 Sec. 13.2.7


RockTextureCom:
Seen in unconsolidated, well sorted sands

RockTextureDesc:
Seen in unconsolidated, well sorted sands


RockTextureCom:
Overlap of tabular or disc-shaped pebbles dipping in an upstream direction

RockTextureDesc:
Overlap of tabular or disc-shaped pebbles dipping in an upstream direction


RockTextureCom:
No matrix, very good sorting and well rounded grains

RockTextureDesc:
No matrix, very good sorting and well rounded grains

RockTextureRef:
BGS Research Report # RR 99-0-03 V3 Sec. 13.2.6


RockTextureCom:
Much matrix, poor sorting and angular grains

RockTextureDesc:
Much matrix, poor sorting and angular grains


RockTextureCom:
Thin, surficial, soft, spongy incrustation around mouth of springs carrying calcium carb in soln

RockTextureCom2:
not sure if belongs in texture (genetic?)

RockTextureDesc:
Thin, surficial, soft, spongy incrustation around mouth of springs carrying calcium carb in soln

RockTextureRef:
BGS Research Report # RR 99-03 V3 Sec. 13.6.4


RockTextureCom:
Little matrix, moderate sorting and soubrounded to rounded grains

RockTextureDesc:
Little matrix, moderate sorting and soubrounded to rounded grains


RockTextureCom:
Rock textures associated with movement on brittle and/or ductile faults/shear zones

RockTextureDesc:
Rock textures associated with movement on brittle and/or ductile faults/shear zones


RockTextureCom:
Cohesive, brecciated texture where <50% rock composed of comminuted matrix

RockTextureDesc:
Cohesive, brecciated texture where <50% rock composed of comminuted matrix


RockTextureCom:
Extreme. fine grnd, pervasively foliated texture where >90% rock composed of dyn. rextallised matrix

RockTextureCom2:
Also BSP 2001! need to check Sibson  ref

RockTextureDesc:
Extreme. fine grnd, pervasively foliated texture where >90% rock composed of dyn. rextallised matrix


RockTextureCom:
Fine grnd, foliated texture where <10% rock composed of dynamically recrystallised matrix

RockTextureDesc:
Fine grnd, foliated texture where <10% rock composed of dynamically recrystallised matrix


RockTextureCom:
Streaked/communited fabric with discrete striated slip surfaces formed during simple shear movement

RockTextureDesc:
Streaked/communited fabric with discrete striated slip surfaces formed during simple shear movement


RockTextureCom:
Relatively coarser grained facies developed in a relatively finer grained rock mass

RockTextureDesc:
Relatively coarser grained facies developed in a relatively finer grained rock mass

RockTextureRef:
BGS Research Report # RR 99-06 V1 Sec. 8.1


RockTextureCom:
Cohesive, brecciated texture where >90% rock composed of comminuted matrix

RockTextureDesc:
Cohesive, brecciated texture where >90% rock composed of comminuted matrix


RockTextureCom:
Noncohesive w <30% mechanically disrupted fragment within fine grnd (largely) clay matrix

RockTextureDesc:
Noncohesive w <30% mechanically disrupted fragment within fine grnd (largely) clay matrix


RockTextureCom:
Minerals w preferred xtallographic orientation formed during eq movement subparallel to slip vector

RockTextureDesc:
Minerals w preferred xtallographic orientation formed during eq movement subparallel to slip vector


RockTextureCom:
Regular intergrowth of two minerals giving a cuniform or runic appearance at microscopic scale

RockTextureDesc:
Regular intergrowth of two minerals giving a cuniform or runic appearance at microscopic scale


RockTextureCom:
Small crystals irregularly included within a larger xtal of another mineral

RockTextureDesc:
Small crystals irregularly included within a larger xtal of another mineral


RockTextureCom:
Intergrowth of alkali feldspar and plag where A>P

RockTextureDesc:
Intergrowth of alkali feldspar and plag where A>P

RockTextureRef:
BGS Research Report # RR 99-06 V1 Sec. 5.1.5.1


RockTextureCom:
Melanocratic & greasy texture. Composed of (largely) qtz and fspar xtals + opx/fayalite present.

RockTextureDesc:
Melanocratic & greasy texture. Composed of (largely) qtz and fspar xtals + opx/fayalite present.

RockTextureRef:
BGS Research Report # RR 99-06 V1 Sec. 5.1.5


RockTextureCom:
Intergrowth of alkali feldspar and plag where  A =  P (usu plag component oligocene/andesine)

RockTextureDesc:
Intergrowth of alkali feldspar and plag where  A =  P (usu plag component oligocene/andesine)


RockTextureCom:
Intergrowth of alkali feldspar and plag where A<P (albite<andesine)

RockTextureDesc:
Intergrowth of alkali feldspar and plag where A<P (albite<andesine)


RockTextureCom:
Sedimentary rocks composed entirely of contiguous crystals and clarified by size

RockTextureDesc:
Sedimentary rocks composed entirely of contiguous crystals and clarified by size

RockTextureRef:
BGS Research Report # RR 99-03 V3 Sec. 13.2.2


RockTextureCom:
Persistant tabular succession of differing components (mineralogy/texture/structure)

RockTextureDesc:
Persistant tabular succession of differing components (mineralogy/texture/structure)


RockTextureCom:
Discrete isolated trace fossils, up to 10% of original bedidng disturbed

RockTextureDesc:
Discrete isolated trace fossils, up to 10% of original bedidng disturbed


RockTextureCom:
Trace fossils generally isolated but locally overlap; 10-40% of original bedding disturbed

RockTextureDesc:
Trace fossils generally isolated but locally overlap; 10-40% of original bedding disturbed


RockTextureCom:
Burrows overlap & often ill-defined, last vestiges of bedding discernable with 40-60% disturbed

RockTextureDesc:
Burrows overlap & often ill-defined, last vestiges of bedding discernable with 40-60% disturbed


RockTextureCom:
Trace fossils still discrete in places, fabric not mixed, bedding completely disturbed

RockTextureDesc:
Trace fossils still discrete in places, fabric not mixed, bedding completely disturbed


RockTextureCom:
Degree of particle size sorting based on statistical spread of particle size frequency (IGSD)

RockTextureCom2:
IGSD=Inclusive Graphic Std Deviation Folk 1974

RockTextureDesc:
Degree of particle size sorting based on statistical spread of particle size frequency (IGSD)

RockTextureRef:
BGS Research Report # RR 99-0-03 V3 Sec. 13.2.4


RockTextureCom:
Degree of textural maturity in a depositional environment

RockTextureDesc:
Degree of textural maturity in a depositional environment


RockTextureCom:
Nature of fabric; includes degree of packing /ratio of clasts to matrix/imbrication

RockTextureDesc:
Nature of fabric; includes degree of packing /ratio of clasts to matrix/imbrication


RockTextureCom:
Arenaceous or rudaceous grade clasts floating in a matrix

RockTextureDesc:
Arenaceous or rudaceous grade clasts floating in a matrix


RockTextureCom:
Arenaceous or rudaceous grade clasts in contact with little or no matrix

RockTextureDesc:
Arenaceous or rudaceous grade clasts in contact with little or no matrix


RockTextureCom:
Depositional layering of sedimentary rocks

RockTextureDesc:
Depositional layering of sedimentary rocks


RockTextureCom2:
Modified from Ingram 1954 and Potter et al. 1980


RockTextureCom:
Distribution of minerals, grains or rocks at a macroscopic scale

RockTextureDesc:
Distribution of minerals, grains or rocks at a macroscopic scale


RockTextureCom:
The breaking along planes of weakness in minerals; eg: cleavage planes

RockTextureDesc:
The breaking along planes of weakness in minerals; eg: cleavage planes


RockTextureCom:
Cm- to metric-scale layer of sedimentary rock bound by discrete surfaces

RockTextureDesc:
Cm- to metric-scale layer of sedimentary rock bound by discrete surfaces


RockTextureCom:
Millimetre-scale layer of sedimentary rock bound by discrete surfaces

RockTextureDesc:
Millimetre-scale layer of sedimentary rock bound by discrete surfaces


RockTextureRef:
BGS Research Report # RR 99-03 V3 Sec. 13.5.2


RockTextureCom2:
ref Powers 1953/Tucker 1991/ Pettijohn et al. 1987


RockTextureCom:
Minerals, lithic fragments or fossils are relatively evenly distributed throughout the rock

RockTextureDesc:
Minerals, lithic fragments or fossils are relatively evenly distributed throughout the rock


RockTextureCom:
Minerals, grains or fossils form isolated quasi-spherical clumps

RockTextureDesc:
Minerals, grains or fossils form isolated quasi-spherical clumps


RockTextureCom:
Comprises mineral grains of one size; normally one type of micro-organism fossil in limestones

RockTextureDesc:
Comprises mineral grains of one size; normally one type of micro-organism fossil in limestones


RockTextureCom:
Degree of hardening due to cementation and/or intergranular solution

RockTextureDesc:
Degree of hardening due to cementation and/or intergranular solution


RockTextureRef:
BGS Research Report # RR 99-03 V3 Sec. 13.2.8


RockTextureCom:
A very hard rock resistant to breakage due to cement or intergranular solution

RockTextureDesc:
A very hard rock resistant to breakage due to cement or intergranular solution


RockTextureCom:
Rock/bedded unit which has an internally consistent texture and composition

RockTextureDesc:
Rock/bedded unit which has an internally consistent texture and composition


RockTextureCom:
Minerals, rock units or fossils which are irregularly distributed through host rock

RockTextureDesc:
Minerals, rock units or fossils which are irregularly distributed through host rock


RockTextureCom:
Coated grains and clasts common to carbonates, phosphorites & iron-rich sediments

RockTextureDesc:
Coated grains and clasts common to carbonates, phosphorites & iron-rich sediments

RockTextureRef:
BGS Research Report # RR 99-03 V3 Sec. 13.3.5


RockTextureCom:
Rounded, internally structureless, microcrystalline carbonate grain 0.1 to 0.5mm, Syn: pellet

RockTextureDesc:
Rounded, internally structureless, microcrystalline carbonate grain 0.1 to 0.5mm, Syn: pellet


RockTextureCom:
+2mm irregular grns w cortex of overlapping laminae, biogenic structures, may lack distinct nucleus

RockTextureDesc:
+2mm irregular grns w cortex of overlapping laminae, biogenic structures, may lack distinct nucleus


RockTextureCom:
Spheroidal coated grn w smooth & evenly laminated cortex, core may have different core comp.

RockTextureDesc:
Spheroidal coated grn w smooth & evenly laminated cortex, core may have different core comp.


RockTextureCom:
Plastically deformed oolith; outer cortical lamallae may be replaced w siderite or phophate mineral

RockTextureDesc:
Plastically deformed oolith; outer cortical lamallae may be replaced w siderite or phophate mineral


RockTextureCom:
Containing fragments of skeletal grains, if the fossil type is identified it should be specified

RockTextureDesc:
Containing fragments of skeletal grains, if the fossil type is identified it should be specified


RockTextureCom:
Containing fragments of weakly consolidated sediment reworked from within area of deposition

RockTextureDesc:
Containing fragments of weakly consolidated sediment reworked from within area of deposition


RockTextureCom:
Fragments of lithologies not represented in the associated environments

RockTextureDesc:
Fragments of lithologies not represented in the associated environments


RockTextureCom:
Degree to which authegenic minerals are ppted into pores of seds, causing them to become lithified

RockTextureDesc:
Degree to which authegenic minerals are ppted into pores of seds, causing them to become lithified


RockTextureCom:
The rock is bound into a rigid dense mass of very low porosity

RockTextureDesc:
The rock is bound into a rigid dense mass of very low porosity

RockTextureRef:
BGS Research Report # RR 99-03 V3 Sec. 13.4


RockTextureCom:
The rock particles are cemented by silica

RockTextureDesc:
The rock particles are cemented by silica


RockTextureCom:
The cement is of unspecified carbonate composition

RockTextureDesc:
The cement is of unspecified carbonate composition


RockTextureCom:
The rock particles are cemented by dolomite

RockTextureDesc:
The rock particles are cemented by dolomite


RockTextureCom:
The rock particles are cemented by siderite

RockTextureDesc:
The rock particles are cemented by siderite


RockTextureCom:
The rock particles are cemented by gypsum

RockTextureDesc:
The rock particles are cemented by gypsum


RockTextureCom:
Hard, dense variety of tufa. Syn: calcareous sinter

RockTextureDesc:
Hard, dense variety of tufa. Syn: calcareous sinter


RockTextureCom:
Diagenetic textural qualifiers specific to limestone

RockTextureDesc:
Diagenetic textural qualifiers specific to limestone

RockTextureRef:
BGS Research Report # RR 99-03 V3 Sec. 3.1.5


RockTextureCom:
Grain stones where pressure solution has caused many grain contacts to consist of styloliltes

RockTextureDesc:
Grain stones where pressure solution has caused many grain contacts to consist of styloliltes


RockTextureCom:
Grain stones where almost all the grain contacts consist of microstylolites

RockTextureDesc:
Grain stones where almost all the grain contacts consist of microstylolites


RockTextureCom2:
BSP thinks some terms relevant in diff. contexts


RockTextureRef:
BGS Research Report # RR 99-0-03 V3 Sec. 7.4


RockTextureCom:
Irregular nodules (usually anhydrite) separated by thin stringers of sediment

RockTextureDesc:
Irregular nodules (usually anhydrite) separated by thin stringers of sediment


RockTextureCom:
bedded non-carbonate salts in which all the beds have been deformed

RockTextureDesc:
bedded non-carbonate salts in which all the beds have been deformed


RockTextureCom:
The original structure of the sediment is no longer recognisable due to deformation

RockTextureDesc:
The original structure of the sediment is no longer recognisable due to deformation


RockTextureCom:
Rock consists of angular fragments of evaporite

RockTextureDesc:
Rock consists of angular fragments of evaporite


RockTextureCom:
Inverted "v" fold at the edge of a large polygon

RockTextureDesc:
Inverted "v" fold at the edge of a large polygon


