New PDF release: Amphiboles: Crystal Chemistry, Occurrence, and Health Issues

By Frank C. Hawthorne, Roberta Oberti, Giancarlo Della Ventura, Annibale Mottana

ISBN-10: 0939950790

ISBN-13: 9780939950799

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Extra info for Amphiboles: Crystal Chemistry, Occurrence, and Health Issues (Reviews in Mineralogy and Geochemistry 67)

Sample text

Am Mineral 68:287-306 Hawthorne FC (1983c) Characterization of the average structure of natural and synthetic amphiboles. Per Mineral Roma 52:543-581 Hawthorne FC (1988) Mössbauer spectroscopy. Rev Mineral 18:255-340 Hawthorne FC (1992) The role of OH and H2O in oxide and oxysalt minerals. Z Kristallogr 201:183-206 Hawthorne FC (1994) Structural aspects of oxides and oxysalt crystals. Acta Crystallogr B50:481-510 Hawthorne FC (1997) Short-range order in amphiboles: a bond-valence approach. Can Mineral 35:201-216 Hawthorne FC (2006) Landmark Papers: Structure Topology.

However, none of these have been truly comprehensive. Four factors have hampered this analysis: (1) lack of reliable site-populations; (2) lack of precise and accurate unit-cell dimensions obtained with a reasonably similar procedure; (3) lack of reliable site- Amphiboles: Crystal Chemistry 43 Figure 34. 98 apfu; Circle: O atom; diamond: H atom; square: Cl atom; contours are drawn at 5, 10, 15, 20 and 25 e/Å3 (from Oberti et al. 1993). populations and chemical compositions for synthetic amphiboles; (4) the observation that a ixed cation-O distance (for instance, as calculated from constituent ionic radii) cannot be used for all amphibole compositions.

23 Å3. As a irst step, the unit-cell parameters were plotted one against the other to understand whether there are forbidden zones for their combination. Figure 35 shows that amphiboles do not occupy all available space, and that discrete populations can be identiied which are mainly related to the nature of the B cations. Multiple stepwise linear regression was then done using the unit-cell parameters as dependent variables. Due to the constraint of the full occupancy of the T and M sites, only the following independent chemical constituents were used: AK, A Na, BNa, B(Fe,Mn)2+, BLi, BMg, CAl, CTi, CFe2+, CFe3+, CLi, TAl, WF, WO2−.

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Amphiboles: Crystal Chemistry, Occurrence, and Health Issues (Reviews in Mineralogy and Geochemistry 67) by Frank C. Hawthorne, Roberta Oberti, Giancarlo Della Ventura, Annibale Mottana


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