Learn about Spinel
, color range from ruby red to cobalt blue, sharp octahedral form, hardness 8, rare gemmy crystals on marble, prized by collectors for rarity and luster.Pein-Pyit
Pein-Pyit, Myanmar — Mogok locality famed for red to purplish-red spinel on calcite and as the type-locality for johnkoivulaite-(Cs), delivering high-contrast…
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