Hibonite vs Spinel
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Hibonite
A calcium aluminum oxide mineral of the magnetoplumbite group first described in 1956 from Madagascar, significant for its occurrence in meteorites and calcium-aluminum-rich inclusions.
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Spinel
Spinel is a magnesium aluminum oxide mineral that crystallizes in the cubic system, highly valued as a gemstone for its hardness and vibrant array of colors. Due to its similar appearance and formation environments, red spinel has been historically confused with ruby for centuries. This confusion is most famously exemplified by the 170-carat Black Prince's Ruby, a large red spinel currently set in...
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