mesocratic


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mesocratic

[‚mez·ə′krad·ik]
(petrology)
Of igneous rock, being intermediate in color between leucocratic and melanocratic due to equal amounts of light and dark constituents.
References in periodicals archive ?
Nepheline in a mesocratic syenite at Lac Rouge, Quebec (locality 76) is replaced by cancrinite and sodalite, which are subsequently altered to natrolite and thomsonite (Corriveau, 1984).
These units vary from fine grained homogenous, non-magnetic crystalline rocks, to larger grained mesocratic units hosting 3 - 5 percent magnetite and demonstrating contact and flow foliation.