...T. C. Devaraju; V. H. Uttangji; J. J. M. M. M. Coolen Copyright © 1983 Geological Society of India 1983 Geological Society of India Journal Geological Society of India Vol, 2 4 , May 1983 pp, 262 to 265 Sheridanite from the V-Ti-Fe deposits of Madangere, North Kanara District, Karnataka T. C...

... series of peaks indicate position and intensity. The bottoms represent the background which is very sensitive to position changes. Typical oscillation-heating patterns of basal spacing maxima for Georgia kaolinite, a Vermont chlorite, a clinochlore, and sheridanite are presented. The kaolinite (001...

...Fig. 3. Petrography of margarite-free and margarite-bearing chloritite (II): a) Interlocking texture exhibited by sheridanite flakes, crossnicols; margarite-free chloritite. b) Kinking in a coarse sheridanite flake, cross-nicols; margarite-free chloritite. c) Deformed margarite crystal in a fine...

...Colin M. Graham; Janet A. Viglino; Russell S. Harmon Abstract Hydrogen-isotope exchange between Mg-Al chlorite of sheridanite composition and water has been studied experimentally over the temperature range 300-700°C. Problems were encountered with changes in the bulk D/H ratios of capsule contents...

...S. A. Forman; H. Kodama; Sydney Abbey Yellow variety of xanthophyllite, associated sheridanite, valuevite, nomenclature of trioctahedral brittle micas, x-ray data, chemical analyses, Zlatoust (Urals, USSR) © 1967 Mineralogical Association of Canada 1967 Mineralogical Association of Canada ...

.... The brucite limestone contains chloritic mica (sheridanite). The dolomites, despite lenticulation, might serve as marker horizons. Two varieties are noted, one with crystals of black euhedral gypsum, the other without them. Most widespread of the schists is a carbonaceous chloritic mica schist which...

... Ankola from the bridge across Gangavali river near Madangere. Mineralogically the Fe-Ti deposit of Madan~ere contains 80 to ,90 per cent magnetite and ilmenite and 10 to 20 per cent chlorite (sheridanite variety) and hogbornite. Spinel is noticed only in a single occurrence. Pyrite is a common accessory...

...Fig. 13. Electron probe microanalyses (EPMA) results. (A) Sericite samples show increasing proportions of phengite via the Tschermak substitution. (B) Chlorite discrimination diagram. Most samples fall within the Ripidolite–Sheridanite fields. Note the chlorites from the intrusion sample plot...

... of calcite, dolomite, spinel, forsterite, clinohumite, apatite, margarite, pargasite, chlorite (sheridanite-clinochlore; Garnier et al . 2008 ), ± graphite, ± pyrite, ± pyrrhotite ( Fig. 1 B). The geological features of the main deposits are described below. Fig. 2. Location of pink and red gem...

... the composition of sheridanite according to the classification of Hey (1954) ( Table 3 , Fig. 3 B), whereas the Cr-bearing clinochlore (kämmererite) reported from other chromitite layers at Luanga ( Diella et al . 1995 ) has not been observed. A chlorite geothermometer based on the amount of IV Al...

...+ ) values plot within a restricted range ( Fig. 13 a ). Chlorites under study, therefore, plot in the sheridanite, pycnochlorite, clinochlore, penninite, and talc-chlorite fields, with a single sample falling in the diabantite field ( Fig. 13 a ). When plotted on an Mg-Al + vacancy-Fe ternary diagram, all...

... series, 1 but the white chlorites, such as sheridanite and colerainite, upon which Conner, Larsen, Shannon, and Wherry 2 have worked. It includes also the “bentonite” minerals which run off into pure aluminous minerals, such as montmorillonite, leverrierite, beidellite, halloysite, and other clay...

... the control line and likelyhave chlorite compositions which are slightly more aluminous (e.g. towards sheridanite–daphnite idealized compositions). Shales plot further away from the origin as they have greater abundances of muscovite and chlorite. Altered samples (asterisks and filled circles...

... studies may be described as several different chlorite minerals though this is not evident in some literature citations; in fact, Post and Plummer (1972) characterized this reference chlorite sample as being made up of penninite, clinochlore, sheridanite, and ripidolite. Furthermore, none...

...; the ferro-magnesio-manganiferous amphiboles are mostly of magnesio-gedrite type. Chlorites constitute 20% of total PGM-associated silicates. They are of highly magnesian and Fe-poor types including sheridanite and penninite. Only one sodic mica was also found in association with pyroxene and laurite...

... . McMurchy R.C. ( 1934 ) The crystal structure of the chlorite minerals. Locality: Miles City, Montana, U.S.A. Note: originally called sheridanite . Zeitschrift fur Kristallographie , 88 , 420 – 432 . Moore D.M. Reynolds R.C. ( 1997 ) X-ray Diffraction and the Identification...

... on kaolinite, muscovite, biotite, rhipidolite, sheridanite and sudoite reference samples. The accuracy of the EDAX measurements was > 90 % relative to the known composition of the reference samples (Pache, pers. comm.). Fe-oxi-hydroxides were removed from the samples prior to the measurement by rinsing them...

... aureole chlorites plot in the clinochlore and sheridanite fields, reflecting their Fe-poor composition ( fig. 5 ). Figure 5. Chlorites in Wadi Semna serpentinites. Note Fe-poor nature of chlorites in aureoles around altered spinels. Fields after Hey ( 1954 ). As noted...