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RM3677   Marcassite, siderite, pyrite
FeS₂
  -  2. Sulfides and sulfosalts

A very aesthetic specimen of marcasite from this classic Portuguese mine. Its stability is ensured by the carbonates in the matrix. Numerous tabular, twinned, lustrous, and iridescent marcasite crystals are present. It is accompanied by well-defined arsenopyrite crystals.

Size: 6.8 x 5.5 x4.2 cm.
Main crystal: 10 mm.
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