aragonite


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aragonite

[ə′räg·ə‚nīt]
(mineralogy)
CaCO3 A white, yellowish, or gray orthorhombic mineral species of calcium carbonate but with a crystal structure different from those of vaterite and calcite, the other two polymorphs of the same composition. Also known as Aragon spar.
References in periodicals archive ?
Drilling rates through shell containing only aragonite and organic matrix were compared to rates through shell containing conchiolin layer(s), as well as aragonite and organic matrix.
In Table 2, the solution at point II in Run B shows a negative value of log [[OMEGA].sub.ara], but indeed aragonite was grown as described herein.
coerulea holobiont will advance our understanding of the mechanism of blue pigment synthesis, and will help answer why it is that only Heliopora coerulea retains a unique, blue, hard crystalline aragonite skeleton in the skeletal evolution of Octocorallia.
In the present study, drill holes were cylindrical and diameters de creased with hole depth, which is typically seen in muricid species (Carriker 1969); both inner and outer circles were measured and recorded, but in some samples, where the reach ing point of the inner layer of the aragonite nacre (see Gao et al.
In this study, we reported crystallographic evolution and unusual nonbiogenic aragonite formation of disposed ACS powder after calcination at 400-1400[degrees]C for 3 hours followed by slow cooling rate (-10[degrees]C [min.sup.-1]) under moist atmospheric air and pressure in Malaysia which has not been reported by other researchers.
Using reconstructions of the temperature and the ocean water composition of the past, the authors estimated the proportion of aragonite and calcite that formed inorganically in the ocean in 85 geological stages across 500 million years.
The results of Experiment 1 show that larval growth began to decline between a mean pH of 7.63-7.54 and a [[OMEGA].sub.Ar] range of 1.06-0.89, within which aragonite began to undersaturate (Table 2).
Place will also be working with Easton-basedBlue Ocean Biosystems Inc.to evaluate the use of oolitic aragonite (OA), a calcium carbonate mineral similar to limestone, as a phosphorus mitigant and recovery solution, as well as identifying beneficial indigenous nitrifying and denitrifying bacteria that can colonize and proliferate in OA.
Objective: Although various aspects of biomineralisation in corals have been studied for decades, The basic mechanism of precipitation of the aragonite skeleton remains enigmatic.
We all pay these costs in time stuck in traffic jams, higher taxes and polluted air.<br />Making concrete bend<br />To develop ductile concrete, our laboratory borrowed ideas from nacre, also known as mother of pearl the iridescent material on the inside of abalone shells.<br />Mollusks make nacre from aragonite, a natural form of calcium carbonate, which by itself is extremely brittle.
There are also pieces of evidence for dissolution of aragonite components and residual aragonite preserved in the limestone beds.
Calcite, aragonite, and vaterite are the main polymorphic forms of calcium carbonate.