cronstedtite definition

  • noun:
    • A trigonal-ditrigonal pyramidal mineral containing hydrogen, metal, air, and silicon.
    • A mineral consisting principally of silicate of metal, and crystallizing in hexagonal prisms with perfect basal cleavage; -- so named from Swedish mineralogist Cronstedt.
    • A black to dark-green mineral with micaceous cleavage, happening in tapering hexagonal prisms or fibrous diverging teams; a hydrous silicate of iron and manganese, found at localities in Bohemia plus in Cornwall, The united kingdomt.
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