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Tetravalent Uranium in Calcite
Science, 1998X-ray absorption spectroscopy and x-ray fluorescence microprobe studies of 35-million-year-old calcite from a Mississippi Valley–type zinc ore deposit indicate substitution of tetravalent uranium for divalent calcium. Thus, tetravalent uranium has a stable location in calcite deposited under reducing conditions.
, Sturchio +4 more
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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.
G, Simmons, P, Bell
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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.
G, Simmons, P, Bell
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Calcite–oleate–oxalate interaction in calcite flotation system
Particulate Science and Technology, 2016ABSTRACTCalcite 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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Electrokinetic behaviour of calcite—the relationship with other calcite properties
Chemical Geology, 2001Six 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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Recrystallization of Magnesian Calcite Overgrowths on Calcite SeedsSuspended in Seawater
Aquatic Geochemistry, 1998The 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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Mesoporous Calcite by Polymer Templating
Crystal Growth & Design, 2008Layered calcite crystals with internal 10−50 nm pores are precipitated from aqueous solution containing a polymer−peptide conjugate that aggregates into pore-forming templates. The zwitterionic peptide sequence behaves as the “binding block” of a double-hydrophilic block copolymer, facilitating templating, nucleation inhibition, and stabilization of ...
G. Page, M. +4 more
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Coherent nanoparticles in calcite
Science, 2017A toughening strategy known to metallurgists is also used by the ...
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Nature, 1959
EXPERIMENTS on etching of calcite have been carried out earlier by a number of workers1 and etch pits on calcite have been reported recently by H. Watts2 and R. C. Stanley3. We have been carrying out experiments on etching of mineral crystals with different etching reagents for some time and have investigated calcite very thoroughly.
N. S. PANDYA, J. R. PANDYA
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EXPERIMENTS on etching of calcite have been carried out earlier by a number of workers1 and etch pits on calcite have been reported recently by H. Watts2 and R. C. Stanley3. We have been carrying out experiments on etching of mineral crystals with different etching reagents for some time and have investigated calcite very thoroughly.
N. S. PANDYA, J. R. PANDYA
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Strontium partitioning in calcite: from inorganic to foraminiferal calcite
Goldschmidt2023 abstracts, 2023Qicui Jia +3 more
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