Tourmaline Crystals- 10.78 g
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Tourmaline crystals from Pachigram, Afghanistan, weighing 10.78 g.
AI-assisted summary
Description from the seller
53.9 carats tourmaline crystals
Origin. Afghanistan
Quality. Good
Suitable for facetation and cabochons
Rare items
Avg size 1.2 carat
• Chemical Formula: Complex boron silicate with aluminum, iron, magnesium, lithium, and other elements.
• Crystal System: Trigonal.
• Hardness: 7–7.5 on the Mohs scale, making it suitable for everyday jewelry.
• Color: Found in almost every color, including green, pink, red, blue, yellow, black, and bi-color or multi-color varieties.
• Luster: Vitreous (glassy).
• Transparency: Transparent to opaque, with transparent stones being the most valuable.
• Refractive Index: Approximately 1.61–1.67, depending on the variety.
• Specific Gravity: 3.00–3.26.
• Cleavage: Indistinct or absent, making it less prone to splitting.
• Fracture: Uneven to conchoidal.
• Pleochroism: Strong, often showing different colors when viewed from different angles.
• Inclusions: May contain liquid inclusions, hollow tubes, growth lines, and mineral crystals.
• Durability: Good toughness and resistance to wear, suitable for rings, pendants, earrings, and bracelets.
• Special Property: Pyroelectric and piezoelectric, meaning it can develop an electric charge when heated or subjected to pressure.
• Major Sources: Brazil, Afghanistan, Pakistan, Mozambique, Nigeria, Madagascar, Namibia, Sri Lanka, and the United States.
53.9 carats tourmaline crystals
Origin. Afghanistan
Quality. Good
Suitable for facetation and cabochons
Rare items
Avg size 1.2 carat
• Chemical Formula: Complex boron silicate with aluminum, iron, magnesium, lithium, and other elements.
• Crystal System: Trigonal.
• Hardness: 7–7.5 on the Mohs scale, making it suitable for everyday jewelry.
• Color: Found in almost every color, including green, pink, red, blue, yellow, black, and bi-color or multi-color varieties.
• Luster: Vitreous (glassy).
• Transparency: Transparent to opaque, with transparent stones being the most valuable.
• Refractive Index: Approximately 1.61–1.67, depending on the variety.
• Specific Gravity: 3.00–3.26.
• Cleavage: Indistinct or absent, making it less prone to splitting.
• Fracture: Uneven to conchoidal.
• Pleochroism: Strong, often showing different colors when viewed from different angles.
• Inclusions: May contain liquid inclusions, hollow tubes, growth lines, and mineral crystals.
• Durability: Good toughness and resistance to wear, suitable for rings, pendants, earrings, and bracelets.
• Special Property: Pyroelectric and piezoelectric, meaning it can develop an electric charge when heated or subjected to pressure.
• Major Sources: Brazil, Afghanistan, Pakistan, Mozambique, Nigeria, Madagascar, Namibia, Sri Lanka, and the United States.
Details
Main mineral
Tourmaline
Mineral form
Crystals
Weight
10.78 g
Origin (region/city)
Pachigram
Country of origin
Afghanistan
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