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www.mineralgallery.co.za Minerals P-T |
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Spinel |
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Name
Spinel
Chemistry
MgAl2O4
Uses
Precious stone, ceramics.
Color-
Colourless, yellow, blue, green, red brown.
Hardness
8
Specific gravity
3.5
Crystal system:
Cubic. crystal form: Octahedra, dodecahedra, twinning
Accompanied by:
dolomite, magnetite, garnet, zircon, corundum
Fracture
Conchoidal
Luster
vitreous
Cleavage
imperfect on (111)
Streak
white
Similar to:
Garnet, zircon, corundum
High-temperature minerals found as accessories in igneous rock, in metamorphosed aluminous schists, in contact metamorphosed limestones and sometimes in high-temperature ore veins.
Gem quality stones come from Sri Lanka, Burma and India in alluvial deposits.
