tourmalinated quartz
Photo courtesy of Scott Papper, GIA GG, AJP, CM (NAJA), Global Gemology & Appraisals
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Variety: Tourmalinated
Species: Quartz Mohs Hardness: 7 out of 10 Color: Clear with long, slender, black tourmaline inclusions RI: 1.544 to 1.553 (very constant) Birefringence: 0.009 SR/DR/AGG: DR Optic Character: Uniaxial positive. Pleochroism: None Spectrum: Not diagnostic Fluorescence: Inert SG: 2.64 to 2.69 (Usually 2.66) |
