vaterite


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vaterite

[′väd·ə‚rīt]
(mineralogy)
CaCO3 A rare hexagonal mineral consisting of unstable calcium carbonate; it is trimorphous with calcite and aragonite.
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According to [6], among the three polymorphs, the vaterite form is less stable and has the ability to transform into one of the other two polymorphs.
Effects of temperature and vaterite replacement on the chemistry of metal ions in the otoliths of Oncorhynchus tshawystcha.
The calcium carbonate crystalline phase in bivalve shells normally is either aragonite or calcite; vaterite has also been found, but seemingly only in pathological conditions (reviewed in Spann et al.
2006) mention that the formation of crystals of calcium carbonate in MTW goes through a process of homogeneous nucleation which leads to the formation of calcite and aragonite, while in normal water there is predominantly vaterite.
9] investigated the effect of synthesis temperature on the abundance of vaterite, aragonite, and calcite, thus delineating regions that are favorable for the formation of these different calcium carbonate polymorphs at temperatures ranging from 25 to 80[degrees]C.
This alga has highly bioavailable micronutrients in its cell wall, high porosity (>40%) that allows for greater specific surface area (DIAS, 2000) and a good balance among polymorphs (calcite, vaterite, aragonite, dolomite), which maintains bioavailability regardless of pH.
The bulk of the mineral component of the shell is calcium carbonate, appearing either in calcite form or as aragonite, and sometimes vaterite.
95 Cordierite Several Components -- Oxides Oxides of Fe/Zn -- Sulfides Sulfides of Ca/Mg/Zn -- Vaterite CaC[O.
3] which exist in several crystallographic polymorphs such as calcite (R-trigonal), aragonite (Porthorhombic), and vaterite (P-hexagonal) [1, 2].
Polymorph selection of calcium carbonate by the morphology of biomacromolecules: from aragonite, vaterite to calcite.
3] modification, vaterite and sometimes, particularly at higher temperatures, metastable aragonite are formed.