microphenocryst

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English[edit]

Etymology[edit]

micro- +‎ phenocryst

Noun[edit]

microphenocryst (plural microphenocrysts)

  1. (geology) A very small crystal in a fine-grained porphyritic rock.
    • 1983, U.S. Geological Survey Bulletin, page 9:
      The basalt of Goose Island of the Ice Harbor Member is unique for the occurrence of microphenocrysts of ilmenite and titanmagnetite.
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