MgAl2O4Cubic
Spinel
MgAl2O4
OxidesChemical FormulaMgAl2O4
Crystal SystemCubic
Mohs Hardness8
Specific Gravity3.58
ColorRed, blue, green, brown, black
LusterVitreous
StreakWhite
CleavageNone
FractureConchoidal to uneven
Occurrence
Found in metamorphic and igneous rocks. Gemstone often confused with ruby.