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prehnite

An orthorhombic mineral, Ca2Al2Si3O10(OH)2, in which Fe replaces Al; forms botryoidal or mammillary and radiating aggregates. Occurs in: hydrothermal veins, cavities, and amygdules in basalt; veins in felsic plutonic rocks; and low-grade metamorphic rocks. Commonly associated with zeolites.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 分数
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