BGS Rock Classification Scheme - Text search results
115 records found. Please click on a code for a "thumbnail" definition.
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| Description | Code |
|---|---|
| Silicate-silt - A type of silicate-mud. In the Rock Classification Scheme, it is a silicate-mud consisting of less than 50% clay-grade particles. Typically, abundant silt is visible with a hand lens and the sediment has a gritty texture. British Geological Survey Research Report RR/99/03, section 2.3 and table 1. | SISILT |
| Silicate-siltstone - A type of silicate-mudstone. In the Rock Classification Scheme, it is a silicate-mudstone consisting of less than 50% clay-grade particles. Typically, abundant silt is visible with a hand lens. British Geological Survey Research Report RR/99/03, section 2.3 and table 1. | SISLST |
| Silicate-sandstone - A type of siliciclastic arenaceous rock. In the Rock Classification Scheme, all siliciclastic arenaceous rocks are given this group name. Silicate-sandstones are divided into arenite and wacke on the proportion of matrix. British Geological Survey Research Report RR/99/03, section 2.2 and fig. 3. | SISST |
| Silicate-sand - A type of siliciclastic arenaceous sediment. In the Rock Classification Scheme, all siliciclastic arenaceous sediments are given this root name. British Geological Survey Research Report RR/99/03, section 2.2 and fig. 3. See also: lime-sand. | SIST |
| Siltstone - A type of mudstone. British Geological Survey Research Report RR/99/03, fig. 13. See: silicate-siltstone. | SLST |
| Smectite-claystone - A type of monomineralic aluminium-silicate sedimentary rock in which the aluminium-silicate mineral is smectite. It is the lithified equivalent of smectite-clay. Bentonite and fullers earth may be considered synonyms for smectite-claystone. Bentonite is a soft, plastic, porous, light-coloured rock composed essentially of clay minerals from the smectite group plus colloidal silica, and produced by chemical alteration of volcanic ash. Fullers earth is a clay consisting largely of hydrated aluminium silicates (e.g. smectite), with a high proportion of water and little plasticity. It is formed by in-situ decomposition of igneous rocks containing a high proportion of glass. British Geological Survey Research Report RR/99/03, sections 9.1 and 13.6, and table 19. | SMCCST |
| Smectite-clay - A type of monomineralic aluminium-silicate sediment in which the aluminium-silicate mineral is smectite. It is the unlithified equivalent of smectite-claystone. British Geological Survey Research Report RR/99/03, section 9.1 and table 19. | SMCLAY |
| Sandy metadolostone and schistose calcsilicate-rock | SMDC |
| Semipelite, micaceous psammite, metalimestone and calcsilicate-rock | SMPM |
| Semipelite, pelite and calcsilicate-rock | SPC |
| Semipelite and calcsilicate-rock | SPCS |
| Gneissose semipelite, pelite and calcsilicate-rock | SPGPCS |
| Semipelite, metacarbonate-rock and calcsilicate-rock | SPMC |
| Phyllitic semipelite, calcsilicate-rock and metalimestone | SPPC |
| Wacke - A type of silicate-sandstone. In the Rock Classification Scheme, wackes have 15 - 75% matrix. British Geological Survey Research Report RR/99/03, section 2.2 and fig. 3. | WACKE |