Microdiorite

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    A course-grained igneous rock, of volcanic origin, containing mostly plagioclase feldspar; a rock whose composition is intermediate between andesite and diorite. countable, uncountable

    "Early Miocene fossiliferous andesitic sediments are associated with some ophiolite massifs in northern Northland: Otaian volcanic grits (Hughes 1966) form a part of Maungaru Range (Fig. 3) and Waitakian–Otaian volcaniclastics are intruded by microdiorite near North Cape (Leitch 1966, 1970)."

Synonyms

All synonyms
markfieldite

Example

More examples

"Early Miocene fossiliferous andesitic sediments are associated with some ophiolite massifs in northern Northland: Otaian volcanic grits (Hughes 1966) form a part of Maungaru Range (Fig. 3) and Waitakian–Otaian volcaniclastics are intruded by microdiorite near North Cape (Leitch 1966, 1970)."

Etymology

From micro- + diorite.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.