BGS Rock Classification Scheme
Mafite - A type of fine-grained normal crystalline rock. It is a general term used for dark-coloured aphanitic rocks. In the Rock Classification Scheme, the class includes andesitic-rock, basaltic-rock, phonolitic-rock, tephritic-rock and foiditic-rock. British Geological Survey Research Report RR/99/06, section 5.2 and fig. 17.
Code | MAFI |
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Description | Mafite - A type of fine-grained normal crystalline rock. It is a general term used for dark-coloured aphanitic rocks. In the Rock Classification Scheme, the class includes andesitic-rock, basaltic-rock, phonolitic-rock, tephritic-rock and foiditic-rock. British Geological Survey Research Report RR/99/06, section 5.2 and fig. 17. |
Qualifiers | No qualifiers currently exist. |
Definition | Fine-grained, av. <0.25mm generally dark coloured, aphanitic normal crystalline extrusive/intrusive rock; composition not defined. |
Linked data | http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/MAFI |
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.