Bastite

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An olive-green, blackish-green, or brownish variety of serpentine mineral resulting from the alteration of orthorhombic pyroxene (esp. enstatite), occurring as foliated masses in igneous rocks; characterized by a schiller (metallic or pearly) on the chief cleavage face of the pyroxene. Syn: schiller spar

Source: Dictionary of Mining, Mineral, and Related Terms


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