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Tag Archives: Cummingtonite

Cummingtonite

Cummingtonite

  Hand Specimen identification: Prismatic habit, two perfect cleavages intersecting at near 60° when viewed in basal section, habit, color (if light brown), and association identify cumming-tonite. It may be confused with other amphiboles, especially anthophyllite and gedrite. Chemical Composition :(Mg,Fe) 7Si8O22(OH)2 Hardness : 51 2 to 6 Specific Gravity2.9 to …

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