This is natural green Tourmaline loose gemstone from afghanistan this piece has excellent and VS clarity. It is completely natural no treatment or any artificial substance has been used. (7.26p)
ATTRIBUTES STONE: NATURAL GREEN TOURMALINE CLARITY: VS ORIGIN: AFGHANISTAN TYPE: NATURAL COLOR: GREEN LENGTH: 10mm WITH: 04mm DEPTH: 04mm
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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