Monoclinic chloritoid: Calculations of unit cell volumes and densities in the pseudo-ternary system Fe-Ctd-Mn-Ctd-Mg-Ctd |
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| Authors: | Ulf Hålenius |
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| Institution: | Swedish Geological Survey, Box 801, S-951 28 Luleå, Sweden |
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| Abstract: | Linear regression analysis of chemical and X-ray data on natural monoclinic chloritoids yields a general formula for the unit cell volume of the mineral: V = 337.2 ()3 + 814.1 (Å3), where r? is the mean ionic radius of the cations in the brucite-type layer. With this function as a basis, the unit cell volumes (V) and the densities (D) of the members of the pseudo-ternary system Fe-Ctd-Mn-Ctd-Mg-Ctd can be calculated. The V-D surface for reported compositions of natural chloritoids has also been defined. |
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