Diaspore
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Diaspore – also called diasporite, empholite, kayserite, or tanatarite – is an aluminium hydroxide oxide mineral, α-AlO, crystallizing in the orthorhombic system and isomorphous with goethite. It occu
Diaspore Margarite rare 09 05b
Corundum
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Corundum is a crystalline form of aluminium oxide typically containing traces of iron, titanium, vanadium, and chromium. It is a rock-forming mineral. It is a naturally transparent material, but can h
Diaspore
…3.4. When heated before the blowpipe, it decrepitates violently, breaking up into white pearly scales. The mineral occurs as an alteration product of corundum or emery and is found in granular limestone and other crystalline rocks. Well-developed crystals are found in the emery deposits of the Ural Mountains…
Several corundum crystals
Corundum from Brazil, size about 2 cm × 3 cm (0.8 in × 1 in)