† microgranuliticadj.GeologyObsoleterare designating a rock structure in which the component minerals occur as discrete grains which are visible only under a microscope.
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1885 A. GeikieText-bk. Geol. (ed. 2) 109 Where the minerals are grouped in small isolated grain-like individuals,..the structure has been named by French petrographers granulitic, or where only discernible by the aid of the microscope, micro-granulitic.