SiO2 rich natural glassAmorphous
Tektite
SiO2 rich natural glass
MineraloidsChemical FormulaSiO2 rich natural glass
Crystal SystemAmorphous
Mohs Hardness5.5
Specific Gravity2.4
ColorBlack, green, brown
LusterVitreous
StreakWhite
CleavageNone
FractureConchoidal
Occurrence
Natural glass formed by meteorite impacts. Found in strewn fields worldwide.