apatite
Photo courtesy of Wikipedia
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Species: Apatite
Mohs Hardness: 5 out of 10 Color: Colorless, pink, green, blue, violet, yellow RI: 1.634 to 1.638 (+0.012 / -0.006) Birefringence: 0.002 to 0.008 SR/DR/AGG: DR Clarity Type: Type II Pleochroism: Uniaxial negative (distorted optic figure possible, may appear biaxial) Spectrum: Not diagnostic Fluorescence: Not diagnostic SG: 3.18 (+/- 0.05) |