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Turquoise
Main Deposits
Iran (the purest), USA (Arizona and Nevada), China, Mexico, and Egypt
Description and Characteristics
Turquoise is a hydrated phosphate of copper and aluminum. It is a secondary mineral that forms in arid zones through the filtration of mineral-rich waters through phosphorus and metal-rich rocks. Its characteristic sky-blue color is due to copper, while greener tones indicate the presence of iron. It often features dark brown or black veins (matrix), which are remnants of the host rock (such as limonite or jasper). It is an opaque stone with a cryptocrystalline structure, giving it a smooth and waxy texture that is very pleasant to the touch.
| Chemical Formula | $$CuAl_6[(OH)_2(PO_4)_4] \cdot 4H_2O$$ |
|---|---|
| Luster | Waxy to sub-vitreous |
| Streak | Bluish-white or greenish |
| Fracture | Conchoidal to uneven |
| Cleavage | Perfect (but rarely visible due to its massive structure) |
| Hardness | 5-6 Mohs |
| Crystal System | Triclinic |
Did you know...?
Its name comes from the French turquois, meaning "Turkish," as the stone reached Europe through trade routes passing through Turkey. It is a porous gem, meaning it can absorb perfumes, oils, or sweat, permanently changing its color toward a greener tone over time. For this reason, it should never be cleaned with soaps or ultrasounds; a soft cloth is enough. In Native American culture (Navajo and Zuni), turquoise is sacred and used to connect with sky spirits and ensure rain.
New-Age Properties
Turquoise is considered the "bridge stone" between heaven and earth. It is deeply linked to the throat chakra, facilitating honest communication and creative expression. It is a healing stone par excellence that brings well-being to the body and strength to the spirit. It is believed to protect the traveler and to change color to warn its owner of imminent danger or illness. It promotes spiritual attunement, dispels negative energy, and helps find creative solutions to problems, instilling inner calm.
Uses of Turquoise
It is extensively used in ethnic and artisanal jewelry, especially set in silver. It is also common to see it in mosaics, amulets, and art objects due to its ease of being carved.