Topaz
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Al2SiO4(F,OH)2
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Topaz is the reference mineral for hardness 8 on the Mohs scale. It forms in granite and pegmatite veins and is prized as a gemstone. Imperial topaz (orange-pink) from Ouro Preto, Brazil, is the most valuable variety.
| Sistem Kristal | Orthorhombic |
| Kelas Mineral | 09 Silicates |
| Kekerasan Mohs | 8.0 |
| Berat Jenis | 3.49-3.57 |
| Warna | Colorless, yellow, blue, pink, orange |
| Kilap | Vitreous |
| Gores | Colorless |
| Belahan | Perfect {001} |
| Pecahan | Conchoidal to uneven |
| Transparansi | Transparent |
| Bentuk Kristal | Prismatic |
Kekerasan Mohs
Mohs Hardness: 8,0 – 8,0
1 Soft10 Hard
| Kekerasan Mohs | Reference Mineral |
|---|---|
| 1 | Talc |
| 2 | Gypsum |
| 3 | Calcite |
| 4 | Fluorite |
| 5 | Apatite |
| 6 | Orthoclase |
| 7 | Quartz |
| 8 | Topaz |
| 9 | Corundum |
| 10 | Diamond |
Sistem Kristal
Orthorhombic
| Sifat | Value |
|---|---|
| Sistem Kristal | Orthorhombic |
| Axial Relationships | a ≠ b ≠ c, α = β = γ = 90° |
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Frequently Asked Questions
What is the hardness of Topaz?
Topaz has a Mohs hardness of 8.0.
What crystal system does Topaz belong to?
Topaz crystallizes in the Orthorhombic crystal system.
What color is Topaz?
Topaz is typically Colorless, yellow, blue, pink, orange.
What type of luster does Topaz have?
Topaz exhibits a Vitreous luster.
What is the chemical formula of Topaz?
The chemical formula of Topaz is Al2SiO4(F,OH)2.