ID: 13
Chemical Formula
CuAl₆(PO₄)₄(OH)₈·4H₂O
Hardness (Mohs)
6
Crystal System
Triclinic
Streak
Pale bluish-white
Luster
Waxlike
Diaphaneity
Translucent on thin edges
Color
Blue, bluish green, green
Cleavage
Basal {001} perfect
Crystal Habit / Mode of Occurrence
Rarely in minute crystals; usually cryptocrystalline. Commonly massive, compact, reniform, stalactitic, in thin seams, incrustations, and disseminated grains. A secondary mineral found in small veins and stringers in decomposed volcanic rocks in arid regions.
Density
2.6-2.8 g/cm³
Fun Facts
1. Turquoise has been used in jewelry for thousands of years, dating back to ancient Egypt and the Aztecs! 2. Some ancient cultures believed turquoise could protect against evil spirits and bring good luck. 3. The finest turquoise is often found in arid regions like Iran, the southwestern U.S., and Tibet.