Mohs scale
A 1–10 scale of scratch hardness. Colour-change diaspore sits at 6.5–7 — comparable to tanzanite or peridot, softer than sapphire (9).
A 1–10 scale of scratch hardness. Colour-change diaspore sits at 6.5–7 — comparable to tanzanite or peridot, softer than sapphire (9).
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