Properties
| Category | Phosphate minerals |
|---|---|
| Formula | CuAl6(PO4)4(OH)8·4H2O |
| Crystal system | Triclinic |
| Color | Turquoise, blue, blue-green, green |
| Crystal habit | Massive, nodular |
| Cleavage | Perfect on {001}, good on {010}, but cleavage rarely seen |
| Fracture | Conchoidal |
| Mohs scale hardness | 5–6 |
| Luster | Waxy to subvitreous |
| Streak | Bluish white |
| Diaphaneity | Opaque |
| Specific gravity | 2.6–2.9 |
From the Wikipedia article
Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula CuAl6(PO4)4(OH)8·4H2O. It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.
Source
Source record: crystal-compendium/turquoise/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.
https://en.wikipedia.org/wiki/Turquoise — revision id 1364040643. Text and properties from Wikipedia, licensed CC BY-SA 4.0.