CAS
No.: 1318-23-6
Molecular
Formula: AlHO2
Molecular
Weight: 59.99
Boehmite
is an aluminium oxide hydroxide (γ-AlO(OH)) mineral, a basic of the aluminium
ore bauxite. It is dimorphous with diaspore. It crystallizes in the
orthorhombic dipyramidal arrangement and is about massive in habit. It is white
with tints of yellow, green, amber or red due to impurities. It has a brittle
to fair luster, a Mohs acerbity of 3 to 3.5 and a specific force of 3.00 to
3.07. It is achromatic in attenuate section, optically biaxial absolute with
refractive indices of nα = 1.644 - 1.648, nβ = 1.654 - 1.657 and nγ = 1.661 -
1.668.
Boehmite
occurs in close laterites and bauxites developed on alumino-silicate bedrock.
It aswell occurs as a hydrothermal about-face artefact of corundum and
nepheline. It occurs with kaolinite, gibbsite and diaspore in bauxite deposits;
and with nepheline, gibbsite, diaspore, natrolite and analcime in nepheline
pegmatites. Industrially, it is used as an bargain blaze retardant accretion
for fire-safe polymers.
It
was aboriginal declared by J. de Lapparent in 1927 for an accident in the
bauxites of Mas Rouge, Les Baux-de-Provence, France, and called for the
Bohemian-German chemist Johann Böhm who agitated out X-ray studies of aluminium
oxide hydroxides in 1925.
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