Turquoise
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CuAl6(PO4)4(OH)8 · 4H2O
Turquoise is a hydrated copper aluminum phosphate that has been prized as a gemstone for thousands of years. The finest specimens exhibit an even sky-blue color. It forms in arid regions through the interaction of copper-bearing solutions with aluminum-rich rocks.
| Crystal System | Triclinic |
| Mineral Class | 08 Phosphates, Arsenates, and Vanadates |
| Mohs Hardness | 5.0-6.0 |
| Specific Gravity | 2.60-2.80 |
| Color | Sky blue, blue-green, green |
| Luster | Waxy |
| Streak | White to pale green |
| Cleavage | None |
| Fracture | Conchoidal |
| Transparency | Translucent |
| Crystal Habit | Massive, nodular, veins |
Mohs Hardness
Mohs Hardness: 5.0 – 6.0
1 Soft10 Hard
| Mohs Hardness | Reference Mineral |
|---|---|
| 1 | Talc |
| 2 | Gypsum |
| 3 | Calcite |
| 4 | Fluorite |
| 5 | Apatite |
| 6 | Orthoclase |
| 7 | Quartz |
| 8 | Topaz |
| 9 | Corundum |
| 10 | Diamond |
Crystal System
Triclinic
| Property | Value |
|---|---|
| Crystal System | Triclinic |
| Axial Relationships | a ≠ b ≠ c, α ≠ β ≠ γ ≠ 90° |
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Frequently Asked Questions
What is the hardness of Turquoise?
Turquoise has a Mohs hardness of 5.0-6.0.
What crystal system does Turquoise belong to?
Turquoise crystallizes in the Triclinic crystal system.
What color is Turquoise?
Turquoise is typically Sky blue, blue-green, green.
What type of luster does Turquoise have?
Turquoise exhibits a Waxy luster.
What is the chemical formula of Turquoise?
The chemical formula of Turquoise is CuAl6(PO4)4(OH)8 · 4H2O.