Results 311 to 320 of about 162,686 (360)

Recrystallization of Magnesian Calcite Overgrowths on Calcite SeedsSuspended in Seawater

Aquatic Geochemistry, 1998
The formation and subsequent reactions of magnesiancalcite overgrowths on calcite were investigated bymeans of closed system seeded precipitationexperiments. These experiments demonstrated that(1) thin overgrowths of magnesian calcite are precipitatedon calcite seeds suspended in seawater;(2) the solubilities of the coatings increase outward from ...
Jane S. Tribble, Fred T. Mackenzie
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Electrokinetic behaviour of calcite—the relationship with other calcite properties

Chemical Geology, 2001
Six carbonate samples of different origin were investigated for their properties: composition, grain-size (Mz), specific surface area (SSA) and electrokinetic (zeta) potential. Four of the samples were of natural origin – one sample was sea sediment, one lake sediment and two limestone rocks. The remaining two samples were synthetic calcites.
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Calcite-Aragonite Equilibrium

Science, 1963
Calcite-aragonite equilibrium, determined with an oscillating Griggs-Kennedy squeezer over the range 100° to 575°C, is given by P = 5500 (± 500) + 12.6 (± 1.5) T where pressure is in bars and temperature is in degrees Celsius.
Peter Bell, Gene Simmons
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Calcite–oleate–oxalate interaction in calcite flotation system

Particulate Science and Technology, 2016
ABSTRACTCalcite is considered a semi-soluble mineral in flotation. Its solubility in acids plays a major role in its floatability. In this study, micro-flotation experiments are conducted to investigate the interaction of calcite particles with potassium oleate (KOl).
S. E. El-Mofty, A. A. El-Midany
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Coherent nanoparticles in calcite

Science, 2017
A toughening strategy known to metallurgists is also used by the ...
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Remarks on “biaxial” calcite [PDF]

Contributions to Mineralogy and Petrology, 1973
Biaxial calcite grains occur in several Egyptian carbonate rocks. The degree of biaxiality is nearly consistent; the optic axial angle being in the range of 8–10°. The reasons of this “biaxiality” are discussed and it is urged that this phenomenon should be considered both in research and teaching.
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Alternate Deposition of Oriented Calcite and Amino Acid Layer On Calcite Substrates

The Journal of Physical Chemistry B, 2008
Material synthesis inspired by novel nacre architecture and mechanism is popular and has attracted more and more attention. In this paper, iso-oriented calcite tablets/layers and amino acid layers were formed alternately on calcite wafers. It is interesting that the neonatal calcite tablets/layers have the same crystal orientation with their inorganic ...
Shanshan Lu, Li Qiao, Zhuo Li, Qingling Feng   +3 more
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Elastic Constants of Calcite

Journal of Applied Physics, 1962
The recent measurements of the elastic constants of calcite by Reddy and Subrahmanyam (1960) disagree with the values obtained independently by Voigt (1910) and Bhimasenachar (1945). The present authors, using an ultrasonic pulse technique at 3 Mc and 25°C, determined the elastic constants of calcite using the exact equations governing the wave ...
Richard A. Robie, Louis Peselnick
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Incorporation of Inorganic Anions in Calcite

European Journal of Inorganic Chemistry, 2004
AbstractA number of analytical methods and techniques (X‐ray diffraction, FT‐IR and electron paramagnetic resonance spectroscopy, ionic chromatography, scanning electron microscopy, etc.) have been used to study the mode and sites of incorporation of some common inorganic anions (SO42−, NO3− and Cl−) in the calcite crystal lattice.
KONTREC JASMINKA, KRALJ DAMIR, BRECEVIC LJERKA, FALINI, GIUSEPPE, FERMANI, SIMONA, NOETHIG LASLO VESNA, MIROSAVLJEVIC KRUNOSLAV   +6 more
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Ferroan calcite replacement indicates former magnesian calcite skeletons

Sedimentology, 1978
ABSTRACTThe replacement by ferroan calcite with preservation of the original structures can be used as a new criterion for identifying skeletons originally composed of high‐magnesian calcite. This applies to bryozoa, rugose corals, echinoderms, many foraminifera, most ostracods, red algae, and serpulids. On the other hand, skeletons originally composed
Detlev K. Richter, Hans Füchtbauer
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