BGS Rock Classification Scheme
Porphyry - A type of fine-grained normal crystalline rock. It is a rock containing phenocrysts and with an aphanitic groundmass of indeterminate origin. British Geological Survey Research Report RR/99/06, section 8.3.
| Code | PPHY |
|---|---|
| Description | Porphyry - A type of fine-grained normal crystalline rock. It is a rock containing phenocrysts and with an aphanitic groundmass of indeterminate origin. British Geological Survey Research Report RR/99/06, section 8.3. |
| Qualifiers | No qualifiers currently exist. |
| Definition | Porphyritic textured crystalline intrusive rock with aphanitic groundmass ( <0.032mm); composition of groundmass & phenocrysts not defined |
| Linked data | http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/PPHY |
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.