SiO2 (+ Al2O3, etc.)Amorphous

Moldavite

SiO2 (+ Al2O3, etc.)

Mineraloids
Chemical FormulaSiO2 (+ Al2O3, etc.)
Crystal SystemAmorphous
Mohs Hardness5.5
Specific Gravity2.4
ColorGreen to brownish green
LusterVitreous
StreakWhite
CleavageNone
FractureConchoidal

Occurrence

Natural glass formed by meteorite impact. Found in Czech Republic. Tektite.

Hardness on Mohs Scale

5.5 / 10
Talc (1)Quartz (7)Diamond (10)