Century Dictionary and Cyclopedia
- n. In petrography, a name given by H.S. Washington (1897), to porphyritic lavas characterized by phenocrysts of augite, olivin, and sometimes feldspars, the ground-mass consisting of feldspar with augite and magnetite. The feldspars are orthoclase and labradorite in nearly equal amounts. Ciminite embraces some of the rocks called trachydolerites.
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