SiO2Trigonal
Jasper
SiO2
SilicatesChemical FormulaSiO2
Crystal SystemTrigonal
Mohs Hardness7
Specific Gravity2.65
ColorRed, brown, yellow, green
LusterVitreous to dull
StreakWhite
CleavageNone
FractureConchoidal
Occurrence
Opaque variety of chalcedony. Found in many colors and patterns.