| 1. | It crystallizes in the isometric system, although crystals are very rare.
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| 2. | It is part of the isometric system and has the space group Fd3m.
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| 3. | "' Lazurite "'is a isometric system although well formed crystals are rare.
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| 4. | "' Gersdorffite "'is a nickel arsenic sulfide mineral with formula NiAsS . It crystallizes in the isometric system showing diploidal symmetry.
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| 5. | "' Nekrasovite "'is a rare copper vanadium sulfosalt mineral with formula isometric system and occurs as small grains in ore aggregates.
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