Fashion Natural Green Cap Tourmaline Crystal with Feldspar Display Specimen From Skardu Valley, 576 Carats 52x62x45mm
FULL DESCRITION
ABOUT ITEM
This is natural green cap tourmaline and feldspar combine crystal specimen from skardu valley. This specimen contain long crystal attached to the Feldspar in the bottom of specimen.
ATTRIBUTES
STONE: NATURAL GREEN CAP TOURMALINE WITH QUARTZ
CLARITY: N/A
ORIGIN: PAKISTAN
TYPE: NATURAL
COLOR: GREEN
LENGTH: 52mm
WITH: 62mm
DEPTH: 45mm
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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