dioritic

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di·o·rite

D0236300 (dī′ə-rīt′)n. Any of various dark, granite-textured, crystalline rocks rich in plagioclase feldspar and having little quartz.
[French, from Greek diorizein, to distinguish : dia-, apart, between; see dia- + horizein, to divide, limit; see horizon.]
di′o·rit′ic (-rĭt′ĭk) adj.