Accueil >  Term: cummingtonite
cummingtonite

A monoclinic mineral, (Fe,Mg)7Si8O22(OH)2; amphibole group; has Mg/(Mg + Fe2+) = 0.30 to 0.69 ; prismatic cleavage; may be asbestiform; in amphibolites and dacites; fibrous varieties (amosite, magnesium rich, and montasite, iron rich) are used as asbestos.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 points
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