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bytownite

A triclinic mineral, (Ca,Na)(Al,Si)AlSi2O8) having 90 to 70 mol % Ca and 10 to 30 mol % Na; of the plagioclase series of the feldspar group; prismatic cleavage; white to gray; forms phenocrysts in some basalts and layered mafic-ultramafic intrusions

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 points
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