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 ?
Presence of protein complex is prerequisite for aragonite crystallization in the nacreous layer.
The presence of nano crystalline phase of calcium carbonate in the homogenous phase of aragonite as the major constituent in both the shells indicated the programmed bio mineralization process taking place in the marine life.
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.
After 24 hours elapsed time, there were 6 peaks of calcite, 1 peak of aragonite and 1 peak of vaterite.
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.
The microsampling was about 100 pm in resolution and at least 50 pg of aragonite powder were collected for stable isotope analysis.
Carbonate minerals such as calcite, dolomite and aragonite have similar optical properties and distinguishing them is often difficult.
Interestingly, in the visible image, Figure 1, it is possible to see regions of coarse and fine grains in the sample and these areas are shown by the Raman image analysis to correspond to calcite and dolomite respectively There was no evidence for any aragonite (peak at 704 c[m.
The results showed that the spring water is supersaturated towards phases of aragonite, calcite and dolomite and is under-saturated towards phases such as gypsum, halite and anhydrite.
KalGUARD works by delivering very low levels of stable zinc into the water to change hard, deposit-forming Calcium Carbonate crystals into soft, non-deposit-forming Aragonite.
In the first case there is a denser protein matrix; in the second case, the protein matrix and the associated deposition of aragonite are looser, thus allowing light trasmission.
Aragonite is one of the main minerals which make up the hard part of many marine microorganisms' skeletons and shells.