Everything about Diaspore totally explained
» For the plant structure, see Diaspore. For the similar word, see Diaspora
Diaspore is a native
aluminium oxide hydroxide, α-AlO(OH), crystallizing in the
orthorhombic system and isomorphous with
goethite and
manganite. It occurs sometimes as flattened crystals, but usually as lamellar or scaly masses, the flattened surface being a direction of perfect cleavage on which the
lustre is markedly pearly in character. 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
mica,
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. Well-developed crystals are found in the emery deposits of the
Urals and at Chester,
Massachusetts, and in
kaolin at Schemnitz in
Hungary. If obtainable in large quantity, it would be of economic importance as a source of aluminium.
Diaspore along with
gibbsite and
boehmite are the major components of the aluminium
ore bauxite.
Other names for diaspore include empholite, kayserite, tanatarite and spelling variations of these.
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