Skip to content
Mineralati

Gemstones

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Turquoise as a Mineral and Gemstone | Uses and Properties

Turquoise as a Mineral and Gemstone | Uses and Properties — via geology.com · Source

Overview

Classic blue-green gem phosphate.

Identification characteristics

  • Mohs hardness 5–6
  • Streak: White to pale green
  • Lustre: Waxy to vitreous

Formation and occurrence

Arid copper-bearing regions

Common uses

Jewellery