huntite

huntite

[′hən‚tīt]
(mineralogy)
CaMg3(CO3)4 A white mineral consisting of calcium magnesium carbonate.
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UltraCarb is a multifunctional hybrid of two minerals from a natural deposit: hydromagnesite (hydrated magnesium carbonate) and huntite (magnesium calcium carbonate).
One of the characteristics of these sites is the liberal use of the brilliant white pigment huntite, [Mg.sub.3]Ca[(C[O.sub.3]).sub.4], (Figure 1) which is found in rare deposits in the Kimberley region.
The quantified phases included aragonite, calcite, dolomite, huntite, mono- and ortho-hydromagnesite, magnesian calcite, magnesite, monohydrocalcite, nesquehonite, spurrite, and vaterite.
(35) Following the formation of MgC[O.sub.3] compound "huntite" at the calcification front, (38) the crystal nucleation takes place.
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.
Troilite FeS, brookite Ti[O.sub.2], siderite FeC[O.sub.3], iron sulfate [Fe.sub.2][(SO4).sub.3], aluminium oxide [Al.sub.2][O.sub.3] and many magnesium compounds--clinoenstatite MgSi[O.sub.3], bredigite [Ca.sub.14][Mg.sub.2][(Si[O.sub.4]).sub.8], merwinite [Ca.sub.3]Mg[(Si[O.sub.4]).sub.2], huntite [Mg.sub.3]Ca[(C[O.sub.3]).sub.4], calcite magnesian (Ca,Mg)C[O.sub.3], sodium calcium magnesium silicate [Na.sub.2][Ca.sub.4][Mg.sub.2][Si.sub.4][O.sub.15] are probably also present.
Small amounts of gypsum associated with huntite have been identified in the silica-carbonate rock of the Clear Creek mine.
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.
Late-stage minerals and alteration products include: heulandite, analcime, aragonite, azurite (rare), bismoclite(?), bismutite, chabazite, chrysocolla, cuprite, goethite, gypsum, huntite, malachite, molybdite, nontronite, stilbite and thulite.
Carbonate Zone Minor Phases Rare Phases Upper paratacamite, carrboydite, kambaldaite, annabergite, glaukosphaerite, azurite, lavendulan, hydrohonessite, retgersite, nepouite, nullaginite, pyrolusite, huntite, olivenite, otwayite, aragonite, calcite, pecoraite pharmacosiderite, [+ or -] dolomite reevesite, takovite, widgiemoolthalite Lower paratacamite, dolomite, kambaldaite huntite Weathered metabasalt immediately adjacent to the gaspeite veins in the upper carbonate zone contains only thin (0.1-5 mm) coatings of lavendulan, gypsum and minor azurite along joint planes.