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Good Quality Rough Natural Black Tourmaline Gemstone 500 grams

SKU:Gems-16

$75.00

Availability: In stock

Short Description

These are very nice shiny Black Tourmaline crystal lots. Some pieces are thin and some are thick. The crystals are of top quality and perfect for wirewrapping.&n...

Description

Details

This is a lot of 500 grams of rough Black Tourmaline Gemstone. One can make a lot of pendants, jewelry, can cut or any thing of your choice.

Tourmaline is extremely popular among collectors and is a well-known gemstone. It is the most multicolored mineral type known, occurring in virtually every color of the spectrum. Individual stones are often multicolored and are unsurpassed in their beauty. Black tourmaline is often seen in pendants and jewelry as a glossy black stone--an experience that varies greatly from viewing it in its more natural, untumbled state. 

Tourmaline Gemstone: What is it?

Stone Type/Family: A member of the Tourmaline family, Silicates class
Category: Silicate mineral group
Chemical formula: (Ca,K,Na,[])(Al,Fe,Li,Mg,Mn)3(Al,Cr, Fe,V)6(BO3)3(Si,Al,B)6O18(OH,F)4
Color: Most commonly black, but can range from brown, violet, green, pink, or in a dual-colored pink and green.
Crystal habit: Parallel and elongated. Acicular prisms, sometimes radiating. Massive. Scattered grains (in granite).
Crystal system: Trigonal
Cleavage: Indistinct
Fracture: Uneven, small conchoidal, brittle
Mohs scale hardness: 7–7.5
Luster: Vitreous, sometimes resinous
Streak: White
Specific gravity: 3.06 (+.20 -.06)
Density: 2.82–3.32
Polish luster: Vitreous
Optical properties: Double refractive, uniaxial negative
Refractive: index nù=1.635–1.675, nå=1.610–1.650
Birefringence: -0.018 to -0.040; typically about .020 but in dark stones it may reach .040
Pleochroism: typically moderate to strong

SHIPMENT POLICY :

Items are shipped as soon as possible but due to location / time zone, destination distance from Pakistan, a few extra time may be required to ship the packages. Retail orders will be done immediately within 1 or 2 days. 

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