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leopardite

A variety of quartz porphyry containing small phenocrysts of quartz in a microgranitic groundmass of quartz, orthoclase, albite, and mica. The rock has a characteristically spotted or streaked appearance due to staining by hydroxides of iron and manganese.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 分数
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