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Download e-book for kindle: Amphiboles: Crystal Chemistry, Occurrence, and Health Issues by Frank C. Hawthorne, Roberta Oberti, Giancarlo Della Ventura,

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

ISBN-10: 0939950790

ISBN-13: 9780939950799

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

Sample text

A–O distances (Å) in joesmithite*. A–O(5)A A–O(5)B A–O(6)A A–O(6)B A–O(7) * from Moore et al. 937 Figure 32. The arrangement of polyhedra around the A cavity and the A site in the Pnma amphibole structure. Table 11. A–O distances (Å) in anthophyllite and sodicgedrite. 370 * from Schindler et al. , Robinson et al. 1971; Cámara and Oberti 2005). The Pnmn amphiboles In the synthetic protoamphibole reported by Gibbs (1969), the chemical analysis (Gibbs et al. 1960) indicated Li at the A site, but Li could not be located by structure reinement.

27b): the equation of the linear-regression relation is given in Table 8. The slope and intercept of the curve are reasonably similar to the analogous values for the M(4) site in the monoclinic magnesium-iron-manganese-lithium amphiboles (Fig. 27a, Table 8), indicating the same cause for this relation. 72 <> (Å)(A) Grand Figure 27. (a) Variation in distance in C2/m Mg-Fe-Mn-Li amphiboles as a function of the aggregate radius of the M(1,2,3) cations; (b) variation in distance in Pnma Mg-Fe-Mn-Li amphiboles as a function of the aggregate radius of the M1,2,3 cations.

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−. In this way, the equations predict deviations from ideal tremolite, ̊ Ca2 Mg5 Si8 O22 (OH)2.

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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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