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Topic: Brucite

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	BRUCITE - LoveToKnow Article on BRUCITE (Site not responding. Last check: 2007-10-21)
		Brucite is usually found as platy masses, sometimes of considerable size, which have a perfect cleavage parallel to the surface of the plates.
		It is white, sometimes with a tinge of grey, blue or green, varies from transparent to translucent, and on the cleavage surfaces has a pronounced pearly lustre.
		Brucite is generally associated with other magnesian minerals, such as magnesite and dolomite, and is commonly found in serpentine, or sometimes as small scales in phyllites and crystalline schists; it has also been observed in metamorphosed magnesian limestone, such as the rock known as predazzite from Predazzo in Tirol.
	www.1911encyclopedia.org /B/BR/BRUCITE.htm (314 words)

	BRUCITE Chapter 22. Oxides and hydroxides
		Franklin brucite occurs as acicular to stout prismatic 1-2 mm crystals with a tapering trigonal pyramidal habit and triangular cross-section.
		Brucite is a magnesium hydroxide mineral and the Mg-analogue of pyrochroite.
		Brucite was first reported from Franklin in a narrow veinlet cutting franklinite-willemite ore. At Sterling Hill, brucite has been found as 1.0 cm platy crystals, intimately mixed with fine-grained orange zincite and associated with calcite, dypingite, and sussexite in the north orebody.
	simplethinking.com /dunn/ch22/brucite.stm (337 words)

	BRUCITE (Magnesium Hydroxide)
		Brucite is a mineral that is not often used as a mineral specimen but does have some important industrial uses.
		Brucite is interesting for another reason because it is often found as a part of the structure of other minerals.
		The individual magnesium hydroxide layers are identical to the individual layers of brucite and are referred to as the "brucite layers".
	mineral.galleries.com /minerals/oxides/brucite/brucite.htm (415 words)

	Brucite - Wikipedia, the free encyclopedia
		Brucite is the mineral form of magnesium hydroxide, with the chemical formula Mg(OH)
		It is pearly white or pale green in colour, translucent, with perfect cleavage, and tabular crystals or massive.
		Brucite is often found in hydothermal veins in serpentine.
	en.wikipedia.org /wiki/Brucite (93 words)

	BRUCITE - Online Information article about BRUCITE (Site not responding. Last check: 2007-10-21)
		Beudant in 1824; the same name had, however, been earlier applied to the mineral now known as chondrodite.
		Brucite is usually found as platy masses, some-times of considerable See also:
		Brucite is generally associated with other magnesian minerals, such as See also:
	encyclopedia.jrank.org /BRI_BUN/BRUCITE.html (361 words)

	QUT \| Science \| News and Events (Site not responding. Last check: 2007-10-21)
		The discovery of the soluble mineral brucite in coral skeletons in both the Great Barrier Reef and Florida Keys is expected to have widespread ramifications within the scientific community because of their importance in studying climate history.
		Mr Nothdurft said what made the presence of brucite in coral skeletons remarkable was that the mineral should dissolve in sea water, not form.
		However, brucite was able to form in isolated micro-environments about the width of a human hair due to the presence of algae, bacteria and fungi which helped it to grow.
	www.sci.qut.edu.au /news/news-event.jsp?news-event-id=4281 (430 words)

	Abstract for Shlomo Neuman's seminar (Site not responding. Last check: 2007-10-21)
		Brucite, Mg(OH)2 is a simple crystalline hydroxide, and is an end-member for hydrous minerals that hosts H2O in the crust and mantle of the Earth.
		We determine the theoretical equation of state for brucite with Ko of 53 GPa and its pressure derivative, Ko' of 6.2, using LDA, and a Ko value of 34 GPa and Ko' of 5.8 with GGA (both, corrected for zero pressure and thermal pressures at T= 300 K).
		We are also exploring the elastic constants (cij) for brucite and their pressure dependence.
	www.geol.vt.edu /general/abstracts/Mookerjee.htm (288 words)

	Chapter 4: Coordination in Brucite (Site not responding. Last check: 2007-10-21)
		In addition the brucite structure shows some properties which are not commonly found in organic structures, which are mainly a high symmetry and a small unit cell with not many electrons in it.
		Weak hydrogen bonds between each layers seem the only possible explanation that the structure is stable, even when this 'hydrogen bonds' lie outside the normal accepted areas (see example 3 in chapter 2).
		Brucite has been investigated by all three models described in chapter 3.
	www.cryst.bbk.ac.uk /PPS2/projects/loesel/chap04.htm (172 words)

	Imaging Spectrometry and Metamorphic Processes
		As in the case of tremolite and serpentine, a previously unrecognized brucite (periclase) zone is indicated adjacent to the intrusive in the northern part of the images.
		This may reflect the fact that brucite (after periclase) has a spectral feature located at approximately the same wavelength as that of dolomite; if that is the case, the SAM values would no longer provide accurate estimates of the relative ratio of calcite and dolomite.
		For example, brucite and serpentine are difficult to identify, and distinguishing ratios of calcite and dolomite in mixed carbonates requires laboratory methods.
	www.sdsmt.edu /es/geology/specres (3992 words)

	425
		For example, gibbsite replacement reactions in lateritic soils, excess Al in fibrous illites from sandstones, and growth of vermicular kaolinite in soils and sedimentary rocks all may be a result of monolayer or polylayer growth of crystalline phases on sheet silicate substrates.
		Growth of gibbsite and brucite on single crystal muscovite sheets was measured in mixed-flow reactors at 80°C, pH 3 (gibbsite) and pH 9 (brucite).
		Semi-empirical ionic modeling of the substrate and growth phases was used to determine the relative binding energies of gibbsite and brucite to the muscovite surface.
	camb.demonhosting.co.uk /JConfAbs/1/425.html (713 words)

	Magnesium - Wikipedia, the free encyclopedia
		It is found in large deposits of magnesite, dolomite, and other minerals.
		Although magnesium is found in over 60 minerals, only dolomite, magnesite, brucite, carnallite, talc, and olivine are of commercial importance.
		In the United States this metal is principally obtained by electrolysis of fused magnesium chloride from brines, wells, and sea water:
	en.wikipedia.org /wiki/Magnesium (1335 words)

	Gibbsite
		Gibbsite's structure is closely related to the structure of brucite[?], Mg(OH)2.
		However the lower charge in brucite's magnesium (+2) as opposed to gibbsite's aluminum (+3) doesn't require that one third of the octahedrons be vacant of a central ion in order to maintain a neutral sheet.
		The different symmetry of gibbsite and brucite is due to the different way that the layers are stacked.
	www.termsdefined.net /gi/gibbsite.html (599 words)

	USGS Open-File Report of01-320 (Site not responding. Last check: 2007-10-21)
		0.22-0.24 in the temperature range 350-450 °C. Brucite has a sheeted crystal structure, and its low frictional strength may be attributed to the relatively weak bonds between the layers.
		Brucite is a common constituent of serpentinite, and at
		The maximum expected brucite content of a serpentinite is close to 20% by weight or volume.
	geopubs.wr.usgs.gov /open-file/of01-320 (307 words)

	Brucite (Site not responding. Last check: 2007-10-21)
		Brucite is a hydroxide of magnesium with the composition Mg(OH)
		These samples of Brucite are displayed in the Smithsonian Museum of Natural History.
		This clear sample of Brucite is about 9x5 cm and is from Cedar Hill quarry, Lancaster County, Pennsylvania.
	hyperphysics.phy-astr.gsu.edu /hbase/Minerals/brucite.html (55 words)

	BRUCITE (Site not responding. Last check: 2007-10-21)
		Brucite is a mineral which is of commercial importance.
		Consequently pure naturally occurring brucite minerals are difficult to obtain and often contain impurities of dolomite, talc serpentinite and other magnesium minerals.
		There are considerable differences in the band positions of brucites reported in the literature.
	labs.sci.qut.edu.au /minerals/mineral%20spectral%20descriptions/B/brucite.htm (415 words)

	H2-rich fluids from serpentinization: Geochemical and biotic implications -- Sleep et al. 101 (35): 12818 -- ...
		and brucite on the mineral compositions of geologic serpentinites
		brucite; that is, (Mg+Fe(II)) >1.5 Si, as occurs in dunites
		of serpentine, brucite, and magnetite is shown in Fig.
	www.pnas.org /cgi/content/full/101/35/12818 (3758 words)

	THE HUMITE GROUP OF MINERALS
		The Humite Group of minerals form a morphotropic series with the mineral olivine and brucite.
		Brucite sheets are also seen in the clay minerals in a similar manner.
		The members of this group differ not only by chemistry but by the number of olivine or silicate layers that are present between the brucite layers.
	mineral.galleries.com /minerals/silicate/humite.htm (347 words)

	LookSmart - Directory - Guides to Brucite (Site not responding. Last check: 2007-10-21)
		Browse an article on brucite that covers a description of the mineral, its composition, and the occurrence and paragenesis.
		Obtain general facts about brucite, as well as the mineral classification, an animation showing the crystallography, a photo, and the optical and physical properties.
		Read a brief description of brucite, a list of associated minerals, and the location in Wisconsin where it is reported.
	lsxml.looksmart.com /p/browse/us1/us317914/us263953/us330812/us553452/us10214928/us10186057/us10186109 (271 words)

	History
		What he found instead was a huge deposit of brucite, which he claimed.
		Although Harry Springer knew that brucite and magnesite could produce magnesium, in l935 there was simply no demand for magnesium.
		Springer's brucite claim was found to contain more than 70-million tons of commercial grade ore, the largest deposit in the United States.
	www.cityofhenderson.com /50/espionage.html (311 words)

	IngentaConnect Serpentine and brucite of ultramafic clasts from the South Chamor... (Site not responding. Last check: 2007-10-21)
		IngentaConnect Serpentine and brucite of ultramafic clasts from the South Chamor...
		Serpentine minerals and brucite in ultramafic rocks from the South Chamorro Seamount were characterized chemically to investigate the serpentinization of the Mariana forearc mantle.
		The secondary minerals are mostly serpentine and brucite with minor magnetite.
	www.ingentaconnect.com /content/minsoc/mag/2004/00000068/00000006/art00005 (303 words)

	MRNFP - Magnesite and brucite (Site not responding. Last check: 2007-10-21)
		It is therefore evident that the North American situation justifies a concerted effort in the exploration and development of magnesite and brucite deposits in Quebec.
		The potential for brucite is highest in the marbles of the Grenville Supergroup, most notably in the Wakefield and Bryson sectors along the Gatineau and Outaouais rivers respectively, and in the Lac-Saint-Jean region.
		Other magnesium bearing minerals are not considered here as there are no known business opportunities for them at the present time.
	www.mrn.gouv.qc.ca /english/mines/minerals/minerals-magnesite.jsp (277 words)

	Brucite -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-21)
		It has a (The property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale) hardness of 2.5.
		Brucite is often found in hydothermal veins in (Click link for more info and facts about serpentine) serpentine.
		Most notable locations include Wood's Chrome Mine, Cedar Hill Quarry, (Click link for more info and facts about Lancaster County, Pennsylvania) Lancaster County, Pennsylvania.
	www.absoluteastronomy.com /encyclopedia/b/br/brucite.htm (82 words)

	AMCSD Search Results (Site not responding. Last check: 2007-10-21)
		Pressure-induced H bonding: Neutron diffraction study of brucite, Mg(OD)2, to
		Compression mechanism of brucite: An investigation by the structural refinement
		Static compression and H disorder in brucite, Mg(OH)2, to 11 GPa:
	rruff.geo.arizona.edu /AMS/result.php?mineral=Brucite (338 words)

	Industrial Specialties News : News In Brief: Texas Brucite facility 75% Complete.(Brief Article) @ HighBeam Research (Site not responding. Last check: 2007-10-21)
		Applied Chemical Magnesias Corp of Fort Collins, CO has completed about 75% of phase I of its new brucite mine and processing facility north of Van Horn, TX (see ISN, Sept 6/99).
		When phase I is complete, by the end of the summer, the company will be able to offer a range of brucitic limestone products.
		Phase II, scheduled for 2001, will entail the addition of a separation system which will produce a very high purity magnesium hydroxide and a high brightness, high purity calcium carbonate byproduct.
	static.highbeam.com /i/industrialspecialtiesnews/july102000/newsinbrieftexasbrucitefacility75completebriefarti/index.html (192 words)

	Brucite Encyclopedia Article, Definition, History, Biography (Site not responding. Last check: 2007-10-21)
		Looking For brucite - Find brucite and more at Lycos Search.
		Find brucite - Your relevant result is a click away!
		Look for brucite - Find brucite at one of the best sites the Internet has to offer!
	www.karr.net /search/encyclopedia/Brucite (255 words)

	Chapter 4c: Quantum Mechanical Coordination in Brucite (Site not responding. Last check: 2007-10-21)
		A picture of the quantum mechanical coordination along the (110)-plane in brucite is shown below.
		The gradient vector field of the electron density in Brucite, showing the diagonal mirror plane through the unit cell, calculated using a STO 6-31** basis set.
		Each hydroxy group shares a face with the hydroxy group of the next layer.
	www.cryst.bbk.ac.uk /PPS2/projects/loesel/chap04c.htm (90 words)

	Brucite (Site not responding. Last check: 2007-10-21)
		CRYSTAL GROWTH AND HABITS - Crystals of Brucite are tabular.
		It is normally found as foliated masses and rosettes.
		OCCURRENCE - Brucite is found in low temperature hydrothermal veins in marbles and schists rich in chlorite.
	www.gc.maricopa.edu /earthsci/imagearchive/brucite.htm (116 words)

	IngentaConnect Nanocrystalline, porous periclase aggregates as product of brucit... (Site not responding. Last check: 2007-10-21)
		Under the electron beam, the hexagonal platelets of brucite immediately decompose and show a morphological shrinkage of 5% and 10-20% in the a and c directions, respectively.
		Since the porosity of the dehydrated material is slightly smaller than the maximum theoretical porosity (54 %), only a small fraction of the voids is transported out of aggregates.
		The decomposition of brucite is interpreted as a complex three-stage process: (i) It proceeds first via an interface-controlled process, starting at the rim of brucite; water escapes through the basal plane.
	api.ingentaconnect.com /content/schweiz/ejm/2001/00000013/00000002/art00009 (355 words)

	IngentaConnect Decomposition of brucite up to 20 GPa: evidence for high MgO-solu... (Site not responding. Last check: 2007-10-21)
		In-situ and ex-situ observations reveal that the brucite decomposition boundary has a negative slope from 11 GPa to 20 GPa.
		Quench textures suggest that brucite dehydrates at least up to 4 GPa but melts incongruently at higher pressure.
		The incon-gruent melting temperature of brucite, that is wet solidus temperature of periclase, decreases with increasing pressure up to 20 GPa.
	dx.doi.org /10.1127/0935-1221/2005/0017-0261 (209 words)

	Experimental Carbonation of Serpentine, Olivine, and Brucite (Site not responding. Last check: 2007-10-21)
		Our experiments mimic either an industrial reaction process (in which the serpentinite would be mined, reacted, and replaced into the mine) or in an in situ process (in which the CO2 is emplaced in a permeable unit associated with a reactive ultramafic).
		Our team is focusing on three common minerals in serpentinite: serpentine, olivine (forsterite), and brucite.
		We use autoclaves and batch reaction vessels to expose the specific mineral to CO2, either in an aqueous environment or a dominantly CO2-fluid environment.
	www.ees.lanl.gov /Publications/Articles/103experim_176.shtml (288 words)

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