Calcite, low

Seawater/basalt ratio Chlorite high (up to 40) Calcite low (0.1-1.8) Chlorite-quartz-rich rock high (more than 50) Epidote-actinolite, albite- quartz, chlorite assemblage low (1.6)... 

Mackenzie F.T., Bischoff W.B., Bishop F.C., Loijens M., Schoonmaker J. and Wollast R. (1983) Magnesian calcites Low-temperature occurrence, solubility and solid-solution behavior, In Carbonates Mineralogy and Chemistry (ed. R.J. Reeder), pp. 97-144. Mineral. Soc. Amer., Chelsea, Mich. 

Almost all deep-sea carbonate-rich sediments are composed of calcite low in magnesium (> 99% CaCOa). This material is primarily derived from pelagic skeletal organisms. Coccolithophores... 

The chief beachrock cements are high-magnesian calcite, low-magnesian calcite, and aragonite (Table 1). Superimposed beachrock levels can result from shoreline progradation if enough sediment is available (Scoffin and Stoddart, 1983). Aragonite-cemented sandstone from the outer continental Atlantic shelf resembles beachrock, but its cementation appears to have been controlled by methane (Allen et al, 1969 Friedman et al, 1971). 

Polyethylene Ground calcite Low and high density polyethylene. 

Zaire, Norway, and the United States (14). It also occurs with calcite, dolomite, apatite, magnetite, and some siUcates. The density of pyrochlore is ca 4.0—4.4 g/cm. The tantalum content usually is low, ca 0.1—0.3% on a metal basis. 

The first alternative is unlikely but not impossible. Past experience suggests that KdSr probably depends on the degree of supersaturation of the solutions with respect to calcite during calcite precipitation (Katz et al., 1972). In the experiments by Shikazono and Holland (1983), the solutions from which anhydrite was deposited were considerably supersaturated. It is therefore possible that the values of K sr extracted from their experimental data are higher than those which controlled the incorporation of Sr in anhydrite during the formation of Kuroko deposits. Experiments at very low degrees of anhydrite supersaturation are needed to determine whether this is a possible explanation for the low Sr content of some of the Kuroko anhydrites. 

CO2 fugacity and that the iron content of epidote in equilibrium with prehnite is lower than that in equilibrium with other minerals such as K-feldspar, K-mica and calcite under such low CO2 fugacity conditions (e.g., Cavaretta et al., 1982). Therefore, it seems clear that iron content of epidote is affected also by CO2 fugacity. 

The REE characterics of calcite from the Au-Ag type are variable. For example, calcites from Sado Au-Ag vein, one of the largest Au-Ag deposits in Japan have both signatures of meteric water and magmatic (or igneous) contributions. Positive Eu anomaly is only found in caleite containing low REE from Au-Ag type (Seigoshi deposit) (Shikazono, unpublished). 

Imai, A. and Uto, T. (2001) Association of electrum and calcite and its significance to the genesis of the Hishikari low-sulfidation epithermal gold deposits, southern Kyushu, Japan. Proc. International Symposium on Gold and Hydrothermal Systems, pp. 83-88. 

Morse JW, Bender ML (1990) Partition coefficients in calcite Examination of factors irrflnencing the validity of experimental resnlts and their application to natural systems. Chem Geol 82 265-277 Mucci A, Morse JW (1990) The chemistry of low temperature abiotic calcites Experimental studies on coprecipitation, stability and fractionation. Rev Aquatic Sci 3 217-254 Musgrove ML, Barmer JL, Mack LE, Combs DM, James EW, Cheng H, Edwards RL (2001) Geochronology of late Pleistocene to Holocene speleothems from central Texas Implications for regional paleoclimate. Geol Soc Am Bull 113 1532-1543... 

Smith PE, Farquhar RM Hancock RG (1991) Direct radiometric age determination of carbonate diagenesis using U-Pb in secondary calcite. Earth Planet Sci Lett 105 474-491 Spalding RF, Mathews TD (1972) Submerged stalagmites from caves in the Bahamas Indicators of low sea level stand. Quat Res 2 470-472... 

For molybdenite concentrates hydroxy ions must be added to maintain a near neutral pH value. The pH value at which the electroleaching of other metal sulfides is conducted depends upon the amount of hydroxy ions added. For example, when a low grade cinnabar ore is treated, the pH remains almost neutral because of the calcite content of the ore. This is also true of carbonaceous gold ores. 

Trace elements can be adsorbed on the surface of calcite, influencing their solubility in calcareous soils of arid and semi-arid zones. The carbonate bound fraction is the major solid-phase component for many trace elements (Cd, Pb, Zn, Ni and Cu) in arid and semi-arid soils, especially in newly contaminated soils (Table 5.3). In Israeli arid soils treated with metal nitrates, the carbonate bound fraction is the largest solid-phase component (60-80%, 50-60%, 40-60%, 30-40%, and 25-36% for Cd, Pb, Zn, Ni, and Cu respectively). Divalent metallic cations at low aqueous concentrations first associate with calcite via adsorption reactions. Then they may be incorporated into the calcite lattice as a co-precipitate by recrystallization (Franklin and Morse, 1983 Komicker et al., 1985 Davis et al., 1987 Zachara et al., 1988 Reeder and Prosky, 1986 Pingitore and... 

The origin of lead present in individual calcite particles could be ascribed by the LAMMA (laser microprobe mass analysis) technique. At low laser irradiances, the desorption mode, information is gathered on metallic species adsorbed on the surface of the particle. At high irradiances the particle is evaporated, revealing the components that coprecipitated with calcite111. 

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