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Spinel

What is Spinel? Group: oxides and hydroxides Subgroup: oxides Etymology: Latin "spinella": little thorn Hardness (Mohs scale): 7.5 to 8 Main deposits : Burma, Sri Lanka, Afghanistan, Tajikistan, Madagascar, Nepal, Tanzania, Thailand, Brazil, Australia, United States Colours: red, blue, colourless, yellow, black, orange, pink, green, violet, grey, brown Chemical composition: MgAl2O4 Crystal system: cubic Composition: magnesium and aluminium oxide Development environment: magmatic rocks or metamorphic limestones. More rarely found in lunar rocks and meteorites.    

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