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peridot

A mineral group including fayalite, Fe2SiO4; forsterite, Mg2SiO4; liebenbergite, (Ni,Mg)2SiO4; and tephroite, Mn2SiO4; orthorhombic; olive green, grayish green, brown, or black; members intermediate in the forsterite-fayalite crystal solution series are common rock-forming minerals in gabbros, basalts, peridotites, and dunites; alters hydrothermally to serpentine. Fayalite occurs in some granites and syenites, forsterite in thermally metamorphosed dolomites, and tephroite in iron manganese ore deposits and their associated skarns.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 分数
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