Macrocryst meaning

(mineralogy) A relatively large crystal occurring in a mineral deposit, usually defined as one between 0.5 mm and 10 mm in size.
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Origin of macrocryst

  • macro- +‎ cryst. First defined by Clement & Skinner in 1979 in their paper "A textural genetic classification of kimberlite rocks" published in Kimberlite Symposium II.
    From Wiktionary