granitoid

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gran·ite

G0229000 (grăn′ĭt)n.1. A common, coarse-grained, light-colored, hard igneous rock consisting chiefly of quartz, orthoclase or microcline, and mica, used in monuments and for building.2. Unyielding endurance; steadfastness: a will of granite.
[Italian granito, from past participle of granire, to make grainy, from grano, grain, from Latin grānum; see gr̥ə-no- in Indo-European roots.]
gra·nit′ic (gră-nĭt′ĭk, grə-), gran′it·oid′ (grăn′ĭ-toid′) adj.