from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A mineral with monoclinic crystals, usually white but can have different colors, Al(OH)3.
from the GNU version of the Collaborative International Dictionary of English
- n. A hydrate of alumina.
from The Century Dictionary and Cyclopedia
- n. A hydrate of aluminium, a whitish mineral, found, in Massachusetts in irregular stalactitic masses, presenting an aggregation of elongated tuberous branches, parallel and united: also found in the Ural and elsewhere, in monoclinic crystals, and often called hydrargillite. Its structure is fibrous, the fibers radiating from an axis.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. white crystalline mineral consisting of aluminum hydroxide; a constituent of bauxite and a source of alumina
The montmorillonite group, which often occurs in the drier tropics, has two silica layers for every one gibbsite.
In its molecular structure thousands of alternate flat layers of silica (silicon oxide) and gibbsite (aluminium oxide) occur, and give the particles their typical hexagonal plate-like structure.
The principal minerals from which aluminum is recovered today are hydrous aluminum oxides, the most prominent of which are bauxite, gibbsite, and diaspore -- the aggregate of all these minerals going commercially under the name of bauxite.
It consists largely of the minerals gibbsite Al (OH) 3, boehmite γ-AlO (OH), and diaspore α-AlO (OH), together with the iron oxides goethite and hematite, the clay mineral kaolinite and small amounts of anatase TiO2.
On 10th February 2010 ABx released details of its maiden resource - 22 million tonnes of gibbsite-rich bauxite on the first target area on EL 6997; based on drilling of less than 10% of known bauxite areas on the Tenement.
These minerals are gibbsite (Al (OH) 3), diaspore (AlO (OH)), and boehmite (AlO (OH)).