BGS Rock Classification Scheme - Text search results
220 records found. Please click on a code for a "thumbnail" definition.
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| Description | Code |
|---|---|
| Metasedimentary rock composed of non-carbonate salts | +#*SNC |
| Sedimentary rock and sediment composed of non-carbonate salts - In the Rock Classification Scheme, this is a non-genetic term for what are commonly called evaporite minerals. Non-carbonate salts are commonly present in a host rock. The host rock may consist of other non-carbonate salts or other types of sediment. British Geological Survey Research Report RR/99/03, section 7 and fig. 11. | +*SNCS |
| Sediment and sedimentary rock - In the Rock Classification Scheme, this high level class includes siliciclastic sediment and sedimentary rock, carbonate sediment and sedimentary rock, phosphate-sediment and phosphorite, iron-sediment and ironstone, organic-rich sediment and sedimentary rock, sedimentary rock and sediment composed of non-carbonate salts, non-clastic siliceous sediment and sedimentary rock, miscellaneous hydroxide, oxide and silicate sediment and sedimentary rock, sedimentary rock based on grain size or crystal size, and hybrid sediment and sedimentary rock. British Geological Survey Research Report RR/99/03. | +*SSR |
| Andesite and basaltic andesite | ABAN |
| Feldspar-phyric andesite and feldspar-phyric basalt | ABFP |
| Agate - A type of chert consisting of translucent cryptocrystalline quartz. This is a variegated chalcedony, commonly mixed or alternating with opal and characterised by banded colours. British Geological Survey Research Report RR/99/03, section 8.2 and fig. 12. | AGATE |
| Agglomerate, basaltic | AGBA |
| Trachytic agglomerate and basaltic agglomerate | AGTB |
| Andesite and basaltic andesite [composite lava/intrusion] | ANBAI |
| Basaltic andesite and felsite | ANBF |
| Basaltic andesite and rhyolite | ANBR |
| Andesite - A type of andesitic-rock. In the Rock Classification Scheme, this name is used for a fine-grained crystalline igneous rock when the modal mineralogy is available, and the mineral mode plots in fields 9 and 10 of the quartz - alkali feldspar - plagioclase - feldspathoid (QAPF) diagram. Andesite and basalt may be separated chemically using SiO2 content: if wt% SiO2 is greater than 52% the rock is andesite. British Geological Survey Research Report RR/99/06, section 5.2 and figs. 17a, 19, 21. | AND |
| Andesite and basalt | ANDB |
| Anhydrite-stone - A type of non-carbonate salt that is composed of particles of the sulphate mineral anhydrite. British Geological Survey Research Report RR/99/03, section 7.1 and fig. 11. | ANHY |
| Basalt - A type of basaltic-rock. In the Rock Classification Scheme, this name is used for a fine-grained crystalline igneous rock when the modal mineralogy is available, and the mineral mode plots in fields 9 and 10 of the quartz - alkali feldspar - plagioclase - feldspathoid (QAPF) diagram. Andesite and basalt may be separated chemically using SiO2 content: if wt% SiO2 is less than 52% the rock is basalt. British Geological Survey Research Report RR/99/06, section 5.2 and figs. 17a, 19. | BA |
| Basalt, alkali - A type of basalt (TAS). In the Rock Classification Scheme, the root name basalt (TAS) may be divided into alkali basalt and subalkali basalt according to the state of silica saturation. If the analysis contains normative nepheline the rock may be called an alkali basalt. British Geological Survey Research Report RR/99/06, section 5.2. | BAALK |
| Basalt and andesite | BAAN |
| Basaltic-andesite - A type of andesitic-rock, classified using the total alkali silica (TAS) classification. The TAS classification may be used if the mineral mode of a normal fine-grained crystalline rock cannot be determined due either to the presence of glass or to the fine-grained nature of the rock. The definition of basaltic-andesite is as shown in British Geological Survey Research Report RR/99/06, section 5.2 and figs. 17b, 20. | BAANDT |
| Basaltic-andesite, porphyritic | BAAPH |
| Basalt and basaltic lava | BABL |