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Diaspore

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It is colorless or greyish-white, yellowish, sometimes violet in color, and varies from translucent to transparent. It may be readily distinguished from other colorless transparent minerals with a perfect cleavage and pearly luster, like talc, brucite, and gypsum by its greater hardness of 6.5 - 7. The specific gravity is 3.4. When heated before the blowpipe it decrepitates violently, breaking up into white pearly scales. Other names for diaspore include empholite, kayserite, tanatarite and spelling variations of these.

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It is colorless or greyish-white, yellowish, sometimes violet in color, and varies from translucent to transparent. It may be readily distinguished from other colorless transparent minerals with a perfect cleavage and pearly luster, like talc, brucite, and gypsum by its greater hardness of 6.5 - 7. The specific gravity is 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. If obtainable in large quantity, it would be of economic importance as a source of aluminium. Other names for diaspore include empholite, kayserite, tanatarite and spelling variations of these.