BGS Rock Classification Scheme
Slate - A type of metamorphic rock with unknown protolith based on textural attributes. In the Rock Classification Scheme, it is defined as a compact fine-grained rock with a strong fissility along planes in which the rock can be parted into thin plates indistinguishable from each other in terms of lithological characteristics. Slates are typically low-grade metamorphosed mudstones. However, some may be derived from volcaniclastic rocks. British Geological Survey Research Report RR/99/02, section 6.1 and fig. 1.
| Code | SLTE |
|---|---|
| Description | Slate - A type of metamorphic rock with unknown protolith based on textural attributes. In the Rock Classification Scheme, it is defined as a compact fine-grained rock with a strong fissility along planes in which the rock can be parted into thin plates indistinguishable from each other in terms of lithological characteristics. Slates are typically low-grade metamorphosed mudstones. However, some may be derived from volcaniclastic rocks. British Geological Survey Research Report RR/99/02, section 6.1 and fig. 1. |
| Qualifiers | No qualifiers currently exist. |
| Definition | Very-fine to fine-grained (<0.25mm), compact, low-grade metamorphic rock; (protolith undefined but commonly mudstone/volcaniclastic rock), well-developed planar fissility, splits into lithologically indistinguishable +/-1mm plates (slaty cleavage). |
| Linked data | http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/SLTE |
CAVEAT
"Thumbnail" definitions attached to some of the table entries are an interim attempt to provide simple short descriptions of the "unqualified" rock types presented within the BGS Rock Classification Scheme. Every effort has been made to ensure accuracy and consistency but minor contradictions or omissions might be present. The BGS welcomes any feedback pointing out such minor imperfections and/or providing constructive comment and suggestions for improvement of the definitions. In the first instance such feedback should be directed to Dr Tim McCormick.