SiO2Trigonal
Quartz
SiO2
SilicatesChemical FormulaSiO2
Crystal SystemTrigonal
Mohs Hardness7
Specific Gravity2.65
ColorColorless, white, purple, pink, brown, black
LusterVitreous
StreakWhite
CleavageNone
FractureConchoidal
Occurrence
One of the most abundant minerals in Earth crust. Found in igneous, metamorphic, and sedimentary rocks worldwide.