Tourmaline Crystals- 3.62 g - (4)
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Four tourmaline crystals from Paprok, Afghanistan, weighing 3.62 g (18.10 carats), untreated and unheated.
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Description from the seller
18.10 carats bicoloUr tourmaline crystals form Afghanistan untreated and uheated
Chemical Composition: Complex boron silicate with aluminum, iron, magnesium, lithium, sodium, 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 black, green, blue, pink, red, yellow, brown, and multicolored varieties.
• Luster: Vitreous (glassy).
• Transparency: Transparent to opaque, with transparent stones being the most valuable.
• Refractive Index: Approximately 1.61–1.66.
• Specific Gravity: About 3.00–3.26, depending on composition.
• Cleavage: Indistinct to poor.
• Fracture: Uneven to conchoidal.
• Pleochroism: Strong, showing different colors or color intensities from different viewing directions.
• Inclusions: May contain liquid-filled tubes, growth lines, and natural mineral inclusions that help identify natural stones.
• Special Properties: Exhibits pyroelectricity and piezoelectricity, meaning it can develop an electric charge when heated or under pressure.
• Durability: Good toughness and resistance to wear, making it ideal for rings, pendants, earrings, and other jewelry.
• Major Sources: Brazil, Afghanistan, Pakistan, Mozambique, Nigeria, Madagascar, Sri Lanka, Namibia, and the United States.
18.10 carats bicoloUr tourmaline crystals form Afghanistan untreated and uheated
Chemical Composition: Complex boron silicate with aluminum, iron, magnesium, lithium, sodium, 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 black, green, blue, pink, red, yellow, brown, and multicolored varieties.
• Luster: Vitreous (glassy).
• Transparency: Transparent to opaque, with transparent stones being the most valuable.
• Refractive Index: Approximately 1.61–1.66.
• Specific Gravity: About 3.00–3.26, depending on composition.
• Cleavage: Indistinct to poor.
• Fracture: Uneven to conchoidal.
• Pleochroism: Strong, showing different colors or color intensities from different viewing directions.
• Inclusions: May contain liquid-filled tubes, growth lines, and natural mineral inclusions that help identify natural stones.
• Special Properties: Exhibits pyroelectricity and piezoelectricity, meaning it can develop an electric charge when heated or under pressure.
• Durability: Good toughness and resistance to wear, making it ideal for rings, pendants, earrings, and other jewelry.
• Major Sources: Brazil, Afghanistan, Pakistan, Mozambique, Nigeria, Madagascar, Sri Lanka, Namibia, and the United States.
Details
Number of objects
4
Main mineral
Tourmaline
Mineral form
Crystals
Weight
3.62 g
Origin (region/city)
Paprok
Country of origin
Afghanistan
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