microdiorite
/ˌmʌɪkrə(ʊ)ˈdʌɪərʌɪt/Geology
noun
Any medium-grained or microcrystalline rock whose mineral composition is the same as that of a diorite.
Origin
1920s; earliest use found in Arthur Holmes (1890–1965), geologist and geophysicist. From micro- + diorite.
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