Tourmaline Rough- 12.01 g
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Rough tourmaline from Kunar, Afghanistan, weighing 12.01 g, unheated and untreated.
AI-assisted summary
Description from the seller
Beautiful faceted rough tourmaline
Weight 60.190 carats
Origin Afghanistan
Unheated and untreated
Tourmaline is October birth stone
* Mineral Group: Tourmaline
* Chemical Formula: Complex Boron Silicate (variable composition)
* Crystal System: Trigonal
* Hardness: 7–7.5 on the Mohs scale
* Specific Gravity: 3.00–3.26
* Refractive Index: 1.614–1.666
* Luster: Vitreous (glass-like)
* Transparency: Transparent to translucent
* Cleavage: Indistinct to poor
* Fracture: Uneven to conchoidal
* Streak: White
* Dispersion: 0.017–0.020 (low)
* Pleochroism: Strong, especially in colored varieties
* Common Colors: Green, blue, pink, red (rubellite), yellow, orange, brown, black (schorl), colorless, and bi-color or multi-color
* Fluorescence: Usually inert to weak; some pink and red tourmalines may show weak fluorescence.
* Durability: Excellent for jewelry due to its good hardness and lack of perfect cleavage.
* Major Sources: Afghanistan, Pakistan, Brazil, Nigeria, Madagascar, Mozambique, Namibia, Sri Lanka, and United States.
Beautiful faceted rough tourmaline
Weight 60.190 carats
Origin Afghanistan
Unheated and untreated
Tourmaline is October birth stone
* Mineral Group: Tourmaline
* Chemical Formula: Complex Boron Silicate (variable composition)
* Crystal System: Trigonal
* Hardness: 7–7.5 on the Mohs scale
* Specific Gravity: 3.00–3.26
* Refractive Index: 1.614–1.666
* Luster: Vitreous (glass-like)
* Transparency: Transparent to translucent
* Cleavage: Indistinct to poor
* Fracture: Uneven to conchoidal
* Streak: White
* Dispersion: 0.017–0.020 (low)
* Pleochroism: Strong, especially in colored varieties
* Common Colors: Green, blue, pink, red (rubellite), yellow, orange, brown, black (schorl), colorless, and bi-color or multi-color
* Fluorescence: Usually inert to weak; some pink and red tourmalines may show weak fluorescence.
* Durability: Excellent for jewelry due to its good hardness and lack of perfect cleavage.
* Major Sources: Afghanistan, Pakistan, Brazil, Nigeria, Madagascar, Mozambique, Namibia, Sri Lanka, and United States.
Details
Main mineral
Tourmaline
Mineral form
Rough
Weight
12.01 g
Origin (region/city)
Kunar
Country of origin
Afghanistan
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