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DIC_ROCK_NAMEV3 (3025 rows)
Dictionary table which is part of version 3 of the BGS Rock Classification Scheme. The main part of the RCS - it contains only single lithologies.

Displaying rows 741 to 760 of 3025

Row	CODE	DESCRIPTION	RCS_STATUS	TRANSLATION	Q1	Q2	USER_ENTERED	DATE_ENTERED	USER_UPDATED	DATE_UPDATED	TRANSFER	DEFINITION_BKING	STATUS
741	GNSKP	Gneiss, microcline-plagioclase	U	Microcline-plagioclase gneiss	microcline	plagioclase	AWEL	11-JUN-02	TMCM	31-AUG-18		Med-coarse-grained (av. 0.25-16mm) crystalloblastic metamorphic rock (protolith undefined) with >5mm irregular/discontinuous layers defined by contrasting text/grainsize/mineralogy, preferred mineral orientation common. Plagioclase>microcline, both 5-20%	C
742	GNSMF	Gneiss, mafic	U	Mafic gneiss	mafic		AWEL	26-FEB-01	TMCM	31-AUG-18		Med-coarse-grained (av. 0.25-16mm) crystalloblastic metamorphic rock (protolith undefined) with >5mm irregular/discontinuous layers defined by contrasting text/grainsize/mineralogy,well developed preferred mineral orientation common. 35-90% mafic minerals	C
743	GNSMI	Gneiss, micaceous	U	Micaceous gneiss	micaceous		AWEL	26-FEB-01	TMCM	31-AUG-18		Medium to coarse-grained (av. 0.25-16mm) crystalloblastic metamorphic rock (protolith undefined) with >5mm irregular/discontinuous layers defined by contrasting texture/grainsize/mineralogy,well developed preferred mineral orientation common. 5-20% micas.	C
744	GNSN	Gneiss, nebulitic	U	Nebulitic gneiss	nebulitic		AWEL	07-MAR-01	TMCM	31-AUG-18		Med-coarse-grained (av. 0.25-16mm) crystalloblastic meta rock (protolith undefined) >5mm irregular/discontinuous layers defined by contrasting text/grainsize/mineralogy, preferred mineral orientation common.Contains ghostly relicts of pre-existing rocks.	C
745	GNSPL	Gneiss, plagioclase	U	Plagioclase gneiss	plagioclase		AWEL	13-MAR-01	TMCM	31-AUG-18		Med-coarse-grained (av. 0.25-16mm) crystalloblastic metamorphic rock (protolith undefined) with >5mm irregular/discontinuous layers defined by contrasting texture/grainsize/mineralogy,well developed preferred mineral orientation common. 5-20% plagioclase	C
746	GNSPMY	Gneiss, protomylonitic	U	Protomylonitic gneiss	protomylonitic		AWEL	15-FEB-01	TMCM	31-AUG-18		Deformed (ductile), intensely foliated rock (protolith undefined) has primary cohesion, contains >50% porphyroclasts (commonly lensoid) in finer grained dynamically recrystallised matrix. >5mm irreg/discontinuous layers preferred min orientation common	C
747	GNSPXB	Gneiss, pyroxene-bearing	U	Pyroxene-bearing gneiss	pyroxene-bearing		AWEL	05-MAR-01	TMCM	31-AUG-18		Medium to coarse-grained (av. 0.25-16mm) crystalloblastic metamorphic rock (protolith undefined) with >5mm irregular/discontinuous layers defined by contrasting texture/grainsize/mineralogy,well developed preferred mineral orientation common.<5% pyroxene	C
748	GNSQFC	Gneiss, quartzofeldspathic	U	Quartzofeldspathic gneiss	quartzofeldspathic		DJLO	01-DEC-06	TMCM	31-AUG-18	I	Not Available	C
749	GNSRM	Gneiss, re-metamorphosed	U	Re-metamorphosed gneiss	re-metamorphosed		AWEL	22-MAR-04	TMCM	31-AUG-18		Remetamorphosed medium to coarse-grained (av. 0.25-16mm) crystalloblastic metamorphic rock (protolith undefined) with >5mm irregular/discontinuous layers defined by contrasting texture/grainsize/mineralogy, well developed preferred min orientation common	C
750	GNSS	Gneiss - A type of metamorphic rock with unknown protolith based on textural attributes. In the Rock Classification Scheme, it is defined as a medium- to coarse-grained inhomogeneous rock, commonly with a well-developed preferred orientation of constituent minerals, and characterised by a coarse foliation or layering that is more widely spaced, irregular or discontinuous than that in a schist. Adjacent layers generally exhibit contrasting texture, grain size, and mineralogy. However, there is a continuum between schists and gneisses, with factors such as the spacing of the foliation and the degree of contrast between adjacent layers contributing to the assignment of a rock to either category. Gneiss is distinguished from schist where some layers are over 5 mm thick. Gneisses generally occur in areas of middle to upper amphibolite or granulite facies metamorphism and can encompass a wide range of lithologies. Note that orthogneiss indicates a rock that is thought to have an igneous protolith, and paragneiss indicates a rock that is thought to have a sedimentary protolith. British Geological Survey Research Report RR/99/02, sections 3.3, 6.1 and fig. 1.	R	Gneiss			GRBA	24-FEB-00	TMCM	22-FEB-19		Medium to coarse-grained (av. 0.25-16mm) crystalloblastic metamorphic rock (protolith undefined) with >5mm irregular/discontinuous layers defined by contrasting texture/grainsize/mineralogy,well developed preferred mineral orientation common	C
751	GNXEN	Granite, xenolithic	U	Xenolithic granite	xenolithic		AWEL	26-FEB-01	TMCM	31-AUG-18		Coarse-grained, av. between 2-16mm normal crystalline intrusive rock; quartz 20-60% of QAPF, feldspar 35-90% alkali feldspar +/- mica/amphibole. Contains fragments of earlier solidified host/other rock in the igneous host, size & composition undefined.	C
752	GOSSAN	Gossan - A type of duricrust. It is a near-surface, iron oxide-rich zone overlying a sulphide-bearing ore deposit, caused by the oxidation and leaching of sulphides. British Geological Survey Research Report RR/99/04, appendix 2.	R	Gossan			GRBA	24-FEB-00	TMCM	13-MAR-19		Weathered suficial part of vein/rock with metals, Cu/Fe/Pb/Zn etc formerly as sulphides. Now red/yellow-brown/black, massive/friable. Fine-grained <0.25mm. Containing oxides/hydroxides of metals, dominantly iron & depleted in sulphur.Synonym, iron-hat.	C
753	GRAV	Gravel [Obsolete code: use V]	N	Gravel			GRBA	24-FEB-00	TMCM	02-OCT-20		Siliciclastic sediment, with >50vol% clasts from pre-existing siliceous rocks. Clasts >50% or predominantly gravel-grade, >2mm. Compostion not defined.	O
754	GREIS	Greisen - A type of metasomatic-rock. It is a granitic-rock altered through interaction with Li-rich and F-rich, and/or B-rich, hydrothermal fluids. British Geological Survey Research Report RR/99/02, section 8.	R	Greisen			GRBA	24-FEB-00	TMCM	22-FEB-19		Altered, commonly coarse-grained (av. 2-16mm) igneous rock, granite (quartz 20-60% of QAPF feldspar 35-90% alkali feldspar); significant chemical/mineralogical alteration by Li & F-/Be-rich hydrothermal fluids; alkali micas +/-tourmaline/cassiterite/topaz	C
755	GRNFEL	Granofels - A type of metamorphic rock with unknown protolith based on textural attributes. It lacks any obvious foliation and layering and is commonly characterised by a granoblastic texture. A granofels can occur at any metamorphic grade with a range of lithologies. Note that orthogranofels indicates a rock that is thought to have an igneous protolith, and paragranofels indicates a rock that is thought to have a sedimentary protolith. British Geological Survey Research Report RR/99/02, sections 3.3, 6.1 and fig. 1.	R	Granofels			GRBA	24-FEB-00	TMCM	22-FEB-19		Granoblastic textured metamorphic rock (grain size, mineralogy, protolith undefined) lacking any obvious foliation, qualifier essential; replaces granulite	C
756	GRNPX	Granofels, pyroxene	U	Pyroxene granofels	pyroxene		AWEL	26-FEB-01	TMCM	31-AUG-18		Granoblastic textured metamorphic rock (grain size, mineralogy, protolith undefined) lacking any obvious foliation, 5-20vol% pyroxene; replaces granulite.	C
757	GUANO	Guano - A type of phosphorite. It is a phosphate-rich deposit formed from the excrement of birds or bats. British Geological Survey Research Report RR/99/03, section 4.2 and fig. 8.	R	Guano			AWEL	21-MAR-01	TMCM	08-MAR-19		Phosphorite sedimentary rock with >50% phosphates of calcium, aluminium or iron dominantly formed from the faeces of birds or bats	C
758	GV	Gravel (Sea bed sediment, based on Folk) - A type of marine sediment. British Geological Survey Research Report RR/99/04, table 8c. Symbol: G	R	Gravel (Sea bed sediment, based on Folk)			GRBA	24-FEB-00	TMCM	13-MAR-19		Not Available	C
759	GVMSDU	Sand, gravelly muddy [Obsolete code: use SVM or SMV]	U	Gravelly muddy sand	muddy	gravelly	AWEL	31-MAY-02	TMCM	02-OCT-20		Siliciclastic sediment, >50vol% clasts from pre-existing siliceous rocks.Clasts >50% or predominantly sand-grade, 0.032-2mm. Mud-grade <0.032mm particles & lesser gravel-grade >2mm clasts, both 5-20%. Composition & depositional environment not defined.	O
760	GVMUD	Mud, gravelly (Sea bed sediment, based on Folk) - A type of marine sediment. British Geological Survey Research Report RR/99/04, table 8c. Symbol: gM	U	Gravelly mud (Sea bed sediment, based on Folk)	gravelly		AWEL	31-MAY-02	TMCM	13-MAR-19		Not Available	C

Displaying rows 741 to 760 of 3025