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.
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
Fracture: Uneven, small conchoidal, brittle
Mohs scale hardness: 7Â–7.5
Luster: Vitreous, sometimes resinous
Specific gravity: 3.06 (+.20 -.06)
Polish luster: Vitreous
Optical properties: Double refractive, uniaxial negative
Refractive: index nÃ¹=1.635Â–1.675, nÃ¥=1.610Â–1.650
Birefringence: -0.018 to -0.040; typically about .020 but in dark stones it may reach .040
Pleochroism: typically moderate to strong
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.
YOUR FEEDBACK IS VERY IMPORTANT AND POSITIVE FEEDBACK IS HIGHLY APPRECIATED..IF YOU ARE UNHAPPY FOR ANY REASON,PLEASE DO NOT LEAVE NEGATIVE OR NEUTRAL FEEDBACK AND ALLOW US TO RESOLVE AND ISSUE(S).THANK YOU
" Discount available on wholesale / bulk / combined sales " Contact US for wholesale
|Condition||New original shape as natural|
|Jewelry Length||non jewelry gemstone item a kind of mineral|
|Origin||Afghanistan / Pakistan|
|Product Weight||500 Gram|
|Size||varies each piece|
|Notes||Weight and size of gemstone may vary slightly due to difference in measurement scales. Color may not appear exactly as in real life due to variation between computer's monitor resolution and lights. The buyer is full responsible for any import customs duties and taxes in his country. We do not have any control over these duties, taxes & etc.|