Friday, March 7, 2014

Batuan Spinel



SPINEL
Name : SPINEL
Formula : MgAl2O4
Color : Various, red to blue to mauve. Dark green, brown. Black
Crystal system : Isometric
Hardness : 7.5 - 8.0 mohs
Luster : Vitreous
Specific Gravity : 3.6 - 4.1
Refractive Index : 1.719
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