SUNSTONE
Photo courtesy of Scott Papper, GIA GG, AJP, CMA (NAJA), Global Gemology & Appraisals
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Variety: Sunstone
Species: Labradorite Group: Feldspar Mohs Hardness: 6 to 6.5 out of 10 Color: Pale pinkish orange and pink to moderate and strongly saturated reddish orange, red-orange and deep red. Red and green bicolor gems exist, but are extremely rare. Phenomena: Aventurescence RI: 1.559 to 1.568 (+/-0.005), Oregon material commonly 1.563 to 1.572. Birefringence: 0.009 SR/DR/AGG: DR Clarity Type: Type II Optic Character: Biaxial positive (often shows twinning in the polariscope) Pleochroism: Oregon material might show very strong red and green pleochroism. Spectrum: Not diagnostic Fluorescence: Inert SG: 2.70 (+/-0.05) |
