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Charnockite (the rock) named after Job Charnock gravestone

View on map:22.570812°N 88.345766°E

Comments

Charnockite is an unusual granitic rock because it contains pyroxene with quartz-feldspar (unstable together when formed in magmas).  The rock seems to be the result of regional high-grade metamorphism (granulite facies) without directed stresses to form foliations.  It is infamous in geology because the type locality is the gravestone of Job Charnock,  an administrator of the English East India Company.  The rock is relatively common in the Calcutta region of India.  The rock was named by T. H. Holland in 1893. 

Description


Charnockite

Charnockite (pronunciation: /ˈtʃɑːrnəkaɪt/) is applied to any orthopyroxene-bearing quartz-feldspar rock, composed mainly of quartz, perthite or antiperthite and orthopyroxene (usually hypersthene) formed at high temperature and pressure, commonly found in granulite facies metamorphic terrain, as an end-member of the charnockite series.

References

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