Results 81 to 90 of about 849 (144)
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Bulletin de Minéralogie, 1978
The introduction of a fifth amphibole group, the Na-Ca-Mg-Fe-Mn-Li group, defined by 0.50 < B(Mg, Fe2+, Mn2+, Li) < 1.50 and 0.50 < = B(Ca, Na) < = 1.50 apfu (atoms per formula unit), with members whittakerite and ottoliniite, has been required by recent discoveries of B(LiNa) amphiboles.
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The introduction of a fifth amphibole group, the Na-Ca-Mg-Fe-Mn-Li group, defined by 0.50 < B(Mg, Fe2+, Mn2+, Li) < 1.50 and 0.50 < = B(Ca, Na) < = 1.50 apfu (atoms per formula unit), with members whittakerite and ottoliniite, has been required by recent discoveries of B(LiNa) amphiboles.
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Differentiating Non-Asbestiform Amphibole and Amphibole Asbestos by Size Characteristics
Journal of Occupational and Environmental Hygiene, 2008Mining or processing asbestos minerals can liberate isolated fibers or fiber bundles regulated as airborne asbestos fibers. Coarsely crystalline amphibole minerals are more common than asbestos in many geologic environments, and disturbance can result in the release of prismatic or acicular single crystals or cleavage fragments resembling asbestos ...
Martin, Harper +3 more
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Classification of the Amphiboles
Reviews in Mineralogy and Geochemistry, 2007Classification is always a highly contentious issue, particular when dealing with a group of minerals as structurally and chemically complicated as the amphiboles, and when trying to satisfy the needs and different scientific philosophies of crystallographers, mineralogists, petrologists and geochemists.
Hawthorne FC, Oberti R
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ON THE CLASSIFICATION OF AMPHIBOLES
The Canadian Mineralogist, 2006Major issues involved in the classifi cation of the amphiboles are examined: (1) the role of (OH), Li and Fe3+, (2) the formal defi nition of a root name, (3) irreducible charge-arrangements and distinct species, (4) the use of prefi xes, (5) the principal chemical variables used in a classifi cation procedure, and (6) the use of the dominant ...
Hawthorne FC, Oberti R
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Calcic amphibole equilibria and a new amphibole-plagioclase geothermometer
Contributions to Mineralogy and Petrology, 1990There is currently a dearth of reliable thermobarometers for many hornblende and plagioclase-bearing rocks such as granitoids and amphibolites. A semi-empirical thermodynamic evaluation of the available experimental data on amphibole+plagioclase assemblages leads to a new thermometer based on the Aliv content of amphibole coexisting with plagioclase in
Holland, T. J. B., Blundy, J. D.
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Short-Range Order in Amphiboles
Reviews in Mineralogy and Geochemistry, 2007Extensive spectroscopic, diffraction and theoretical work in the last ten years has shown that short-range order (SRO) of both cations and anions is a common feature of amphiboles (Hawthorne et al. 2005). From an experimental perspective, the problem is that SRO does not obey the translational symmetry of the structure in which it occurs, and hence SRO
HAWTHORNE F. C, DELLA VENTURA, Giancarlo
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Long-Range Order in Amphiboles
Reviews in Mineralogy and Geochemistry, 2007Comprehensive knowledge of the order-disorder relations in amphiboles is essential to (1) complete understanding of the crystal chemistry of these minerals, and to (2) the use of amphiboles in thermodynamic calculations (e.g., of temperature and pressure of equilibration) where accurate activity models are critical to the accuracy of such treatments ...
Oberti R +3 more
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The European Legacy, 1996
(1996). Amphiboles of identity. The European Legacy: Vol. 1, Fourth International Conference of the International Society for the study of European Ideas, pp. 826-831.
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(1996). Amphiboles of identity. The European Legacy: Vol. 1, Fourth International Conference of the International Society for the study of European Ideas, pp. 826-831.
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Amphibole: First Occurrence in a Meteorite
Science, 1967This is the first report of an amphibole mineral found in any meteorite. The amphibole richterite (soda tremolite), Na 2 Ca(Mg,Fe) 5 Si 8 O 22 (OH,F) 2 , occurs as a primary (preterrestrial) mineral enclosed within ...
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