References in periodicals archive ?
Carbonates are predominant minerals, aragonite, bassanite and series of 4-methylsteranes were identified exclusively in this sample, whereas minerals of feldspar and zeolite groups, as well as dolomite and Carich dolomite (or ankerite) were absent.
This result may be explained in view of previous findings showing that pearlin constitutes an indivisible functional unit with pearl keratin from the nacreous layer of pearls and oyster shells, which is required for aragonite crystallization (Matsushiro et al.
In the shell, the presence of calcium carbonate in two crystallographic aragonite and calcite phase was identified, which is found to be sharp.
coerulea is its blue, hard, crystalline aragonite skeleton, because Heliopora is more closely related to soft coral species (Octocorallia) than to hard coral species (Hexacorallia).
Calcium carbonate has three anhydrous polymorphs, which are, in order of increasing solubility, calcite (rhombohedra), aragonite (orthorhombic) and vaterite (hexagonal).
Aragonite levels drop by about 50 percent around individual reefs compared with levels in the open ocean, the analysis suggests.
In nature, aragonite formed by geogenic process under high pressure at low temperature or biogenic process [11].
This pattern is caused by domains of stacked aragonite tablets in alternating orientations (Hanni, 2010).
The team reconstructed a rainfall record stretching back 450 years from unprecedented speleothem samples from Yok Balum cave in Belize using uranium thorium dating from the chemical composition in the speleothems containing aragonite, which is high in uranium.
Fish otoliths are laminated aragonite structures that have been used as a proxy of time series for environmental studies.
The California Current is one of the first places worldwide that will experience surface to seafloor aragonite under-saturation.