eilat stone
Photo courtesy of Scott Papper, GIA GG, AJP, CM (NAJA), Global Gemology & Appraisals
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Species: Eilat Stone
Mohs Hardness: 5 to 6 out of 10 Color: Semitranslucent to opaque, blue to green with mottled appearance. Usually a combination of chrysocolla and malachite, but can also contain turquoise, copper and other minerals. RI: Depending on where you test: Chrysocolla: 1.50 Turquoise: 1.61 Malachite: Blinking from around 1.66 to OTL Birefringence: Malachite areas may have birefringence of 0.250 SR/DR/AGG: AGG Spectrum: Not diagnostic Fluorescence: Inert SG: Typically 2.80 to 3.20 (Varies when copper minerals are present) |
