CE ÎNSEAMNĂ ARAGONITE ÎN ENGLEZĂ?
aragonit
Aragonitul este un mineral carbonatat, una dintre cele două forme cristaline de calciu, CaCO3, obișnuite. Se formează prin procese biologice și fizice, inclusiv precipitații din mediul marin și al apei dulci. Ariile de cristal aragonit diferă de cea a calcitului, rezultând o formă de cristal diferită, un sistem ortorombic cu cristale aciculare. Înfrățirea repetată are ca rezultat formate pseudo-hexagonale. Aragonitul poate fi coloană sau fibroasă, uneori în ramificații sub formă de stalactitică numite flos-ferri din asocierea lor cu minereurile din minele de fier din Carintia.
Definiția aragonite în dicționarul Engleză
Definiția aragonitului în dicționar este un mineral în general alb sau gri, descoperit în roci sedimentare și ca depozite din izvoare termale. Compoziție: carbonat de calciu. Formula: CaCO3. Structura cristalului: ortorombic.
CĂRȚI ÎN ENGLEZĂ ÎN LEGĂTURĂ CU «ARAGONITE»
Descoperă întrebuințarea
aragonite în următoarea selecție bibliografică. Cărți în legătură cu
aragonite și extrase din aceasta pentru a furniza contextul de întrebuințare al acestuia în literatura Engleză.
1
Thermodynamics in Geochemistry : The Equilibrium Model: The ...
THE CALCITE-ARAGONITE PHASE DIAGRAM The simplest type of phase
diagram involves a single component that can exist in more than one crystalline
form, that is, a mineral having two or more polymorphs. For example, CaCC>3
can ...
Department of Geology University of Toronto Greg M. Anderson Professor of Geochemistry, Department of Geological and Geophysical Sciences Princeton University David A. Crerar Professor of Geochemistry,
1992
2
The Book of Stones: Who They Are and What They Teach
Aragonite is a calcium carbonate mineral with a hardness of 3.5 to 4. It occurs in
various colors, including white, gray, reddish, yellow-green and blue. The most
popular varieties for metaphysical use are Red Aragonite and Blue Aragonite.
Robert Simmons, Naisha Ahsian,
2007
3
An Introduction to Mineral Sciences
Subsequent growth of aragonite may be kinetically easier than new nucleation of
calcite even when the crystallite size makes calcite the more stable phase. The
solid state transformation of the aragonite to calcite is completely inhibited at ...
4
Microfacies of Carbonate Rocks: Analysis, Interpretation and ...
Aragonite: Orthorhombic aragonite differs from calcite in its higher specific gravity
and hardness, lack of cleavage, and a high Sr/Ca ratio that varies with water
temperatures. In skeletal aragonites, physicochemical processes play a major
role ...
5
Carbonate Sedimentology and Petrology
we are now dealing with a group of minerals with differing solubilities, the main
process is not one of calcite dissolution, but instead (1) dissolution of the more
soluble phases (aragonite and magnesium-calcite), (2) resultant oversaturation
with ...
Peter A. Scholle, Noel P. James, J. F. Read,
1989
6
The Sea Floor: An Introduction to Marine Geology
An Introduction to Marine Geology Eugen Seibold, Wolfgang H. Berger. Table 3.3
. Inorganic constituents and carbonate minerals in hard parts of marine
organisms (for systematics see Appendix A9) Bacteria Aragonite (CaCCb), iron
oxide, ...
Eugen Seibold, Wolfgang H. Berger,
1996
7
The absorption & reflection of calcite &
aragonite for ...
The absorption and reflection curves of calcite and aragonite, as dependent upon
the direction of vibration between 1.7 ft and 1 5 //, show three regions of
characteristic bands at 6.6 /u, 1 1.5 ft and 14. 1 ft respectively. 2. For calcite the
reflection ...
Reuben Edson Nyswander,
1909
8
Perspectives on Karst Geomorphology, Hydrology, and ...
Therefore, this means that the cave water responsible for the formation of the
original calcite was more influenced by soil-derived organic carbon, and that the
cave water for the aragonite formation was more buffered with overlying
limestone.
Russell S. Harmon, Carol M. Wicks, Derek C. Ford,
2006
than that of the open structure of calcite under the influence of solvation by the
water molecules, the genesis of aragonite is favored in solutions with a
diminished solvation effect of water. This can be brought about by mixing the
water with ...
George V. Chilingar, Harold Joseph Bissell, Rhodes Whitmore Fairbridge,
1967
Some physical data for calcite and aragonite Specific gravity Crystal system
Space group Ca coordination Optical form Gibbs free energy kcal Ivr1 Crystal
habit 2.713 Rhombohedral R-3c 6 -ve -26978 2.929 Orthorhombic Pnma 9 -ve -
269.53 ...
ȘTIRI NOI CARE INCLUD TERMENUL «ARAGONITE»
Află ce ziare naționale și internaționale au scris despre și cum este întrebuințat termenul
aragonite în contextul următoarelor știri.
Hard soft coral: New genus and species of 'living fossil' octocoral …
Blue coral forms a massive skeleton of aragonite calcium-carbonate. Due to this unique feature, blue corals have long been placed within their ... «Phys.Org, Iul 15»
Acidity levels in Chukchi and Beaufort seas could reach threatening …
A form of calcium carbonate in the ocean, called aragonite, is used by animals to construct and maintain shells. When calcium and carbonate ... «Techie News, Iun 15»
Arctic acidification poses risks to crustaceans and fish
When calcium and carbonate ion concentrations slip below tolerable levels, aragonite shells can begin to dissolve, particularly at early life ... «FIS, Iun 15»
Climate Change 101
... their shells by calcification, combining natural calcium and carbonate ions to form calcium carbonate in the form of aragonite or calcite. «The Journal, Iun 15»
Charles Manson's lover Star, 26, on a shopping date with disciple …
'Afton was mesmerised by the aptly named Aragonite Star Clusters and Crystacola and made a few purchases – but she paid for everything out ... «Daily Mail, Iun 15»
What's the link between sea shells and toothpaste?
The crystals of calcium carbonate can take on three forms: calcite, aragonite and vaterite. This means that while these crystals are all built of the ... «Irish Independent, Iun 15»
Arctic Ocean Becoming So Acidic It May Start Dissolving Shells Of …
Marine animals use a particular form of calcium carbonate known as aragonite to create their shells, but when concentrations of calcium and ... «Tech Times, Iun 15»
Myth busted: What climate change will really mean for coral
The team found that although climate change could make southern areas more favourable for growth in terms of temperature and aragonite, ... «New Zealand Herald, Iun 15»
Recent research into the carbonate minerals market: global industry …
The common varieties of carbonate minerals are dolomite, calcite and aragonite among which calcite is the principal mineral of marble and ... «WhaTech, Iun 15»
Journal Highlight: The inversion of aragonite to calcite during the …
Aragonite samples were hand-ground and milled from sclerosponge, coral, and mollusc specimens using a computerized micromill. An X-ray ... «spectroscopyNOW.com, Mai 15»