mineral
Turquoise (Dyed Howlite or Magnesite imitation)
Hydrated phosphate of copper and aluminum / CuAl6(PO4)4(OH)8·4H2O
AI-generated identification · may be incorrectHardness: 5-6 (authentic) or 3.5 (Howlite); Color: Robin-egg blue to green; Luster: Waxy to sub-vitreous; Crystal Structure: Triclinic; Cleavage: None.
- Hardness
- 5-6 (authentic) or 3
- Color
- Robin-egg blue to green
- Luster
- Waxy to sub-vitreous
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Physical properties
Hardness: 5-6 (authentic) or 3.5 (Howlite); Color: Robin-egg blue to green; Luster: Waxy to sub-vitreous; Crystal Structure: Triclinic; Cleavage: None.
Formation & geological history
Secondary mineral formed in the oxidation zone of copper deposits by the percolating of acidic aqueous solutions through aluminous and phosphorous-rich rocks.
Uses & applications
Primarily used as a gemstone in jewelry (beads, cabochons, inlay) and for ornamental decorative objects.
Geological facts
Turquoise is one of the oldest known gemstones, used by Ancient Egyptians and Native Americans for over 5,000 years. It is frequently faked using dyed howlite or stabilized with resins.
Field identification & locations
Identify in the field by its distinct sky-blue color and association with arid climates near copper mines. To detect fakes like this bracelet, look for dye concentration in cracks or use an acetone-soaked swab.
