hydromagnesite


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Related to hydromagnesite: hydrotalcite

hydromagnesite

[‚hī·drō′mag·nə‚zīt]
(mineralogy)
Mg4(OH)2(CO3)3·3H2O A white, earthy mineral crystallizing in the monoclinic system and found in small crystals, amorphous masses, or chalky crusts.
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These carbonates are known to form at more intensive carbonation conditions, while hydromagnesite is preferably formed at higher pH [8], hence hydromagnesite being the predominant carbonate formed in the present experiments.
The slight underestimation of [Mg.sup.2+] suggests that the precipitation of magnesian calcite, hydromagnesite, nesquehonite, or sepiolite is almost negligible in the soils under study.
Likya Minelco Mining Company exports the minerals which is extracted from untite and hydromagnesite beds that is only found in western province of Denizli.
(1) EDXA spectra have revealed the formation of magnesium carbonate hydrates at the primer liquid/vapor interface, dypingite [[Mg.sub.5](C[O.sub.3])4 (OH)[.sub.2]*8[H.sub.2]O] and hydromagnesite [[Mg.sub.5] (C[O.sub.3])[.sub.4](OH)[.sub.2]*4[H.sub.2]O].
The minerals considered include calcite, gypsum, hydromagnesite, nesquehonite, and sepiolite.
Depending on the intended industrial mineral use, natural brucite competes for its share of the market with synthetic brucite, commonly referred to in the manufacturing industry by its chemical formula, magnesium hydroxide, and with other minerals and compounds such as magnesite, dolomite, huntite, hydromagnesite, MgO, CaO, zeolites and others.
Hydromagnesite [Mg.sub.5](C[O.sub.3])[.sub.4](OH)[.sub.2]*4[H.sub.2]O
A mixture of huntite and hydromagnesite, Ultracarb imparts a flame retardant action when mixed into polymers by means of the evolution of carbon dioxide and water at temperatures above 225 [degrees] C.
Hydromagnesite is a common constituent of the serpentinite surrounding the mercury-mineralized silica-carbonate rock.
Associated minerals are: shabynite, iowaite, ekaterinite, korshunovskite, halite, hydromagnesite and a serpentine mineral.
Species confirmed by X-ray diffraction during this study include alstonite, anglesite, ankerite, aragonite, barytocalcite, barite, brochantite, epsomite, harmotome, hydromagnesite, jarosite, marcasite, melanterite, millerite, serpierite, siderite, sulfur and witherite.
Crusts of rare, tiny ([less than]0.1 mm) crude brownish gray translucent rhombohedral calcite crystals, of no great collector interest have been found locally on vertical joint surfaces with hydromagnesite, but no iron sulfates (incompatible solution chemistries).