Keratophyre
A rock subtype
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Name:
From the Greek keras = horn
A term originally used for a quartz-bearing orthoclase-plagioclase rock with a dense groundmass, but later used for albitized felsic extrusive rocks consisting essentially of albite with minor mafic minerals, often altered to chlorite. Potassic keratophyres are also recognized in which the feldspar is orthoclase. Commonly associated with spilites and interbedded with marine sediments.
A name generally applied to all salic extrusive and hypabyssal rocks characterized by the presence of albite or albite-oligoclase and chlorite, epidote, and calcite, generally of secondary origin.
Ref: AGI
A name generally applied to all salic extrusive and hypabyssal rocks characterized by the presence of albite or albite-oligoclase and chlorite, epidote, and calcite, generally of secondary origin.
Ref: AGI
Unique Identifiers
Mindat ID:
50647
Long-form identifier:
mindat:1:1:50647:6
Classification of Keratophyre
Trachyte appears in field 7 in the QAPF diagram.
Trachyte is found in field T in the TAS diagram.
Other Language Names for Keratophyre
German:Keratophyr
Common Associates
Associated Minerals Based on Photo Data:
| 1 photo of Keratophyre associated with Pyrite | FeS2 |
| 1 photo of Keratophyre associated with Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| 1 photo of Keratophyre associated with Garnet Group | X3Z2(SiO4)3 |
| 1 photo of Keratophyre associated with Feldspar Group |
Internet Links for Keratophyre
mindat.org URL:
https://www.mindat.org/min-50647.html
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