greisen definition

  • noun:
    • A granitic stone composed mainly of quartz and mica.
    • A highly changed granitic rock containing quartz and mica
    • A crystalline stone consisting of quarts and mica, typical within the tin parts of Cornwall and Saxony.
    • A rock of the granitic family members, having a crystalline-granular texture, and chiefly composed of quartz and mica.
    • a granitic stone composed of quartz and mica

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