Spinel
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Two very dark red twins stuck together so as to give an impression of pentagonal symmetry (a five-pointed star in which one point would be missing).
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Added on11/10/2024
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Mineral guide
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.
Regional guide
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