Brucite


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Related to Brucite: gibbsite

brucite

[′brü‚sīt]
(mineralogy)
Mg(OH)2 A hexagonal mineral; native magnesium hydroxide that appears gray and occurs in serpentines and impure limestones; hardness is 2.5 on Mohs scale, and specific gravity is 2.38-2.40.

Brucite

 

(named after the American mineralogist A. Bruce, died 1818), a mineral of the hydroxide group; chemical composition, Mg(OH)2. The magnesium may be partially replaced by Fe2+ or Mn2+ (ferroand manganobrucites). Brucite crystallizes in a trigonous system and consists of colorless or white (rarely bluish) mica-like crystals, or masses of them, with a layered structure, or sometimes fine-fibered (so-called nemalite) or dense, sinter-like aggregates. Its hardness on the mineralogical scale is 2.5; its density, 2,370-2,400 kg/m3. Formed during hydrothermal changes in ultrabasic magnesial rocks and metamorphosis of dolomites, brucite is found with asbestos in veins of serpentine dunites or peridotites. It may be used as a magnesium ore. In the USSR deposits of brucite have been discovered in massifs of serpentinites and metamorphosed dolomites in the Urals, the Caucasus, and Siberia. Abroad the best known deposits are in the USA, Canada, Italy, and Yugoslavia.

G. P. BARSANOV

References in periodicals archive ?
But the color of the surrounding area of periclase particles of the cement paste cured for 240 days was much deeper, and a small amount of brucite was generated at 20[degrees]C of water.
As mentioned above, when CH reacts with MgS[O.sub.4] in the presence of water, according to [36], gypsum and brucite are formed, but the pozzolanic addition, in the case of nanosilica, avoids the production of brucite but not the decalcification of the C-S-H because NS consumes calcium hydroxide, which is not available for the production of magnesium hydroxide or brucite.
Plots of the saturation indices of anhydrite, aragonitc, brucite. calcite, disordered and ordered dolomite and gypsum in different soils at two equilibration times.
Brucite type hydroxides M(OH)2 (M = Ca, Mn, Co, Fe, Cd) IR and Raman spectra, neutron diffraction of Fe(OH)2.
LDHs and HDSs have a brucite {Mg[(OH).sub.2]} type layer structure in which magnesium ions are surrounded by six hydroxide ions in an approximately octahedral geometry with exchangeable anions occupying the interlayer region [7].
However, examination using polarizing and fluorescence microscopy on concrete submerged in North Sea for 16 years showed a good and unchanged microstructure apart from the formation of discontinuous brucite, Mg[(OH).sub.3], layer on the outer few milimetres [Nijland and de Bruijn in 18].
(14.) Churakov, SV, Iannuzzi, M, Parinello, M, "Ah Initio Study of Dehydroxylation--Carbonation Reaction on Brucite Surface." J.
Looking in turn at mineral materials and mineral processing, the 71 papers discuss such topics as an experimental study on using fuxin natural zeolite to prepare molecular sieves, the technological mineralogy of slag film of medium carbon steel, a mathematical model for predicting the internal parameters of a ball mill, flotation characteristics of brucite and serpentine, the reaction behavior of rare earth elements in reduction, and the ultrafine grinding processing of zirconium silicate.
This could be attributed to brucite or hydromagnesite formation at higher curing ages, since sepiolite has a magnesium compound present in its composition.
& Kristensen, M.B.--2004--Serpentine and brucite of ultramafic clats from the South Chamorro Seamount (Ocean Drilling Program Leg 195, Site 1200): inferences for the serpentinization of the Mariana forearc mantle--Miner.
8a, b), it was discovered that the P-Na and P-Mg mainly consisted of Ni[(OH).sub.2] having different polymorphism and Brucite (Mg[(OH).sub.2]) phases.