CuAl6(PO4)4(OH)8·4H2OTriclinic
Turquoise
CuAl6(PO4)4(OH)8·4H2O
PhosphatesChemical FormulaCuAl6(PO4)4(OH)8·4H2O
Crystal SystemTriclinic
Mohs Hardness6
Specific Gravity2.7
ColorBlue, blue-green, green
LusterWaxy to vitreous
StreakWhite to greenish
CleavageGood
FractureConchoidal
Occurrence
Found in arid regions. Prized gemstone for thousands of years. Used in Native American jewelry.