The aluminium compounds in the bauxite may be present as gibbsite ( Al ( OH ) 3 ), boehmite ( AlOOH ) or diaspore ( AlOOH ); the different forms of the aluminium component will dictate the extraction conditions.
12.
"' Aluminium hydroxide oxide "'or "'aluminium oxyhydroxide "', AlO ( OH ) is found as one of two well defined crystalline phases, which are also known as the minerals boehmite and diaspore.
13.
Bauxite is often thought of as a mineral but it is really a rock composed of hydroxide and oxyhydroxide minerals such as gibbsite, boehmite ( ?-AlO ( OH ) ), and diaspore ( ?-AlO ( OH ) ), as well as clays, silt, and iron oxides and hydroxides.
14.
It is a " poorly crystallized " Al 3 + compound with the composition Al 2 O 3 * x H 2 O ( 1.0 < x < 2.0 ) with interplanar spacings increased in the [ 020 ]-direction to 0.67 nm in comparison with 0.617 nm for boehmite.
