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 |
|---|---|
| Pelite and calcsilicate-rock | PECS |
| Pelite - A type of metasedimentary rock composed largely of quartz, feldspar and mica. In the Rock Classification Scheme, it is one with mica component >40%, and quartz + feldspar <60% of quartz + feldspar + mica. The mica component includes all minerals other than quartz and feldspar, with the exception of calcsilicate and carbonate minerals. British Geological Survey Research Report RR/99/02, section 3.2, table 1 and fig. 5. | PEL |
| Graphitic pelite, calcareous pelite, calcsilicate-rock and psammite | PGCP |
| Phosphate-gravel - A type of phosphate-sediment. In the Rock Classification Scheme, it is one in which over 25% of clasts are larger than 2 mm. The grain size classes are defined in the same way as the siliciclastic sediments. British Geological Survey Research Report RR/99/03, section 4.1, table 10 and fig. 8. See also: silicate-gravel. | PHGV |
| Phosphate-mud - A type of phosphate-sediment. In the Rock Classification Scheme, it is one in which over 75% of the clasts are smaller than 32 µm. The grain size classes are defined in the same way as the siliciclastic sediments. British Geological Survey Research Report RR/99/03, section 4.1, table 10 and fig. 8. See also: silicate-mud. | PHMUD |
| Phosphate-sand - A type of phosphate-sediment. In the Rock Classification Scheme, it is one in which clasts are predominantly 32 µm to 2 mm, with less than 75% of the clasts smaller than 32 µm and less than 25% larger than 2 mm. The grain size classes are defined in the same way as the siliciclastic sediments. British Geological Survey Research Report RR/99/03, section 4.1, table 10 and fig. 8. See also: silicate-sand. | PHSND |
| Psammite, pelite, semipelite and calcsilicate-rock | PPSPC |
| Psammite - A type of metasedimentary rock composed largely of quartz, feldspar and mica. In the Rock Classification Scheme, it is one with mica component <20%, and quartz + feldspar 80 - 100% of quartz + feldspar + mica. The mica component includes all minerals other than quartz and feldspar, with the exception of calcsilicate and carbonate minerals. British Geological Survey Research Report RR/99/02, section 3.2, table 1 and fig. 5. | PSAMM |
| Psammite and calcsilicate-rock | PSCA |
| Psammite, semipelite and calcsilicate-rock | PSSC |
| Silicate-claystone - A type of silicate-mudstone. In the Rock Classification Scheme, it is a silicate-mudstone consisting of greater than 50% clay-grade particles. The rock is extremely fine-grained with a homogeneous appearance. British Geological Survey Research Report RR/99/03, section 2.3 and table 1. | SARCST |
| Calcareous semipelite, micaceous psammite and calcsilicate-rock | SCMC |
| Sandstone - An arenaceous sedimentary rock based on grain size or crystal size. British Geological Survey Research Report RR/99/03, fig. 13. See: silicate-sandstone. | SDST |
| Semipelite - A type of metasedimentary rock composed largely of quartz, feldspar and mica. In the Rock Classification Scheme, it is one with mica component 20 - 40%, and quartz + feldspar 60 - 80% of quartz + feldspar + mica. The mica component includes all minerals other than quartz and feldspar, with the exception of calcsilicate and carbonate minerals. British Geological Survey Research Report RR/99/02, section 3.2, table 1 and fig. 5. | SEMPEL |
| Silicate-clay - A type of silicate-mud. In the Rock Classification Scheme, it is a silicate-mud consisting of greater than 50% clay-grade particles. Typically, the sediment displays plastic properties. British Geological Survey Research Report RR/99/03, section 2.3 and table 1. | SICLY |
| Silicate-conglomerate - A type of siliciclastic rudaceous rock. In the Rock Classification Scheme, all siliciclastic rudaceous rocks are given this group name. British Geological Survey Research Report RR/99/03, section 2.1 and fig. 2. | SICOG |
| Silcrete - A type of silicate-conglomerate, consisting of surficial sand and gravel cemented into a hard mass by silica. British Geological Survey Research Report RR/99/03, section 8.5. | SICRET |
| Silicate-gravel - A type of siliciclastic rudaceous sediment. In the Rock Classification Scheme, all siliciclastic rudaceous sediments are given this root name. British Geological Survey Research Report RR/99/03, section 2.1 and fig. 2. See also: lime-gravel. | SIGV |
| Silicate-mudstone - A type of siliciclastic argillaceous rock. In the Rock Classification Scheme, all siliciclastic argillaceous rocks are given this group name. They may be further classified as silicate-siltstone or silicate-claystone based on the proportion of silt to clay. British Geological Survey Research Report RR/99/03, section 2.3 and fig. 5. | SIMST |
| Silicate-mud - A type of siliciclastic argillaceous sediment. In the Rock Classification Scheme, all siliciclastic argillaceous sediments are given this group name. They may be further classified as silicate-silt or silicate-clay based on the proportion of silt to clay. British Geological Survey Research Report RR/99/03, section 2.3 and fig. 5. See also: lime-mud. | SIMUD |