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 |
|---|---|
| Ferricrete - A type of duricrust. It is a conglomerate consisting of surficial sand and gravel cemented into a hard mass by iron oxide derived from the oxidation of percolating solutions of iron salts. British Geological Survey Research Report RR/99/03, section 13.6; RR/99/04, appendix 2. Synonyms: iron laterite, iron pan. | FECRTE |
| Basalt, feldspar-phyric | FPBA |
| Hawaiite, basaltic, feldspar-phyric | FPBHAW |
| Group-1-kimberlite - A type of kimberlite. Group-1-kimberlite corresponds to archetypal rocks from Kimberley, South Africa that formerly were termed basaltic kimberlites. These are volatile-rich (dominantly CO2), potassic, ultrabasic rocks which commonly exhibit a distinctive inequigranular texture resulting from the presence of macrocrysts (and in some instances megacrysts) set in a fine-grained matrix. British Geological Survey Research Report RR/99/06, section 6.4. | G1KMB |
| Glassy basalt and glassy andesite | GLBA |
| Glassy microgabbro, glassy basalt and glassy andesite | GMBA |
| 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. | GREIS |
| Gypsum-sediment - A type of non-carbonate salt-sediment that is composed of particles of the sulphate mineral gypsum. It is the unlithified equivalent of gypsum-stone. British Geological Survey Research Report RR/99/03, section 7.2 and fig. 11. | GYPSED |
| Gypsum-stone - A type of non-carbonate salt that is composed of particles of the sulphate mineral gypsum. It is the lithified equivalent of gypsum-sediment. The textural classification of gypsum-stones follows that for limestone. British Geological Survey Research Report RR/99/03, section 7.2 and fig. 11. | GYPST |
| Halite-stone - A type of non-carbonate salt that is composed of particles of the chloride mineral halite. British Geological Survey Research Report RR/99/03, section 7.1 and fig. 11. | HALIST |
| Hawaiite - A sodic trachybasalt. British Geological Survey Research Report RR/99/06, section 5.2 and figs. 17b, 20. | HAW |
| Basaltic-rock, hornfelsed | HBAR |
| Basalt, hornfelsed | HFBA |
| Hyaloclastite, basaltic | HYBA |
| Kainite-stone - A type of non-carbonate salt that is composed of particles of the sulphate mineral kainite. British Geological Survey Research Report RR/99/03, section 7.1 and fig. 11. | KAINST |
| Kernite-stone - A type of non-carbonate salt that is composed of particles of the borate mineral kernite. British Geological Survey Research Report RR/99/03, section 7.1 and fig. 11. | KERNST |
| Kieserite-stone - A type of non-carbonate salt that is composed of particles of the sulphate mineral kierserite. British Geological Survey Research Report RR/99/03, section 7.1 and fig. 11. | KIEST |
| Kimberlite - A type of exotic crystalline igneous rock. Kimberlites are currently divided into two groups. Group-1-kimberlite corresponds to archetypal rocks from Kimberley, South Africa that formerly were termed basaltic kimberlites. Group-2-kimberlite corresponds to micaceous or lamprophyric kimberlites. Recent studies have demonstrated that these two groups are mineralogically different and petrogenetically separate rock types. British Geological Survey Research Report RR/99/06, section 6.4. | KMB |
| Potassic-trachybasalt - A potassic trachybasalt. British Geological Survey Research Report RR/99/06, section 5.2 and figs. 17b, 20. | KTRBA |
| Lime-pseudosparstone - A type of limestone, classified on the basis of its diagenetic texture. It is a limestone composed almost totally of a divergent radial fibrous calcite cement in which grains or in-situ biogenic material do not constitute a framework. The calcite pseudospar occurs as in-situ botryoidal masses commonly found in the core of algal mounds and probably formed from early diagenetic alteration of aragonite masses. The diagenetic process does not cause any alteration to the depositional or biological texture. British Geological Survey Research Report RR/99/03, section 3.1, table 3 and fig. 6. | LMPSST |