This is Natural green Tourmaline crystal from Afghanistan. This specimen has two portion one at the top one in the bottom. Bottom is transparent and top is translucent.
ATTRIBUTES STONE: NATURAL GREEN TOURMALINE CLARITY: VVS ORIGIN: AFGHANISTAN TYPE: NATURAL COLOR: GREEN LENGTH: 40mm WITH: 18mm DEPTH: 16mm
ABOUT STONE Tourmaline’s colors have many different causes. It’s generally agreed that traces of iron, and possibly titanium, induce green and blue colors. Manganese produces reds and pinks, and possibly yellows. Some pink and yellow tourmalines might owe their hues to color centers caused by radiation, which can be natural or laboratory-induced.
CHEMISTRY MINERAL: Tourmaline CHEMISTRY: Elbaite Na(Li1.5,Al1.5)Al6Si6O18(BO3)3(OH)4 Dravite NaMg3Al6Si6O18(BO3)3(OH)4 Liddicoatite Ca(Li2Al)Al6Si6O18(BO3)3(OH)3F Chromedravite NaMg3Cr6Si6O18(BO3)3(OH)4 COLOR: All colors REFRACTIVE INDEX: 1.624 to 1.644 BIREFRINGENCE: 0.018 to 0.040 SPECIFIC GRAVITY: 3.06 (+0.20, -0.06) MOHS HARDNESS: 7 to 7.5
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