mesocratic

mesocratic

[mez-uh-krat-ik, mes-, mee-zuh-, -suh-]
adjective Petrology.
(of an igneous rock) composed of light and dark minerals in nearly equal amounts.

Origin:
1855–60; meso- + -crat + -ic

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World English Dictionary
mesocratic (ˌmɛsəˈkrætɪk)
 
adj
(of igneous rocks) containing 30--60 per cent of ferromagnesian minerals
 
[C20: from meso- + -crat, with allusion to the moderately dark colour of the rock. Compare leucocratic]

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