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Mineral & Rock Specimens
29g Labradorite 40mmx20mm Labradorite
General Category feldspar, tectosilicate Chemical formula (Ca,Na)(Al,Si)4O8, where Ca/(Ca + Na) (% Anorthite) is between 50%-70% Identification Crystal system triclinic Twinning common Cleavage three directions Streak white Specific gravity 2.71 to 2.74 Refractive index 1.555 to 1.575 Other characteristics Labradoresc