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name is derived in reference to the stone's sharp formation. they are popularly found as water-worn pebbles, but also occur as octahedral crystal formations. during the mining process, they are often confounded with sapphire and ruby. key facts black spinel is amongst the few naturally occurring stones
family- spinel composition– (mg,zn)al o . refractive index– - hardness- colors- other than black they come in red, pink, blue, yellow, and amber deposits- brazil, afghanistan, madagascar, nigeria, and nepal related products black spinel black onyx aquamarine amethyst carnelian chrome diopside other stones...
https://www.finegemsny.com/product/black-spinel/