Garnet solid solutions

The garnet structure also forms a wide range of complete solid solutions. Rare-earth ions can be substituted partially or totally on c sites examples of these solutions are Y3, jSm, Fe50i2 and Gd3, jEU ,Fe50i2 (Heilner Grodkiewicz, 1973) and Y3, jLu, Fe50i2 (Gyorgy et al, 1973). In all these cases, lattice parameters vary linearly with composition. 

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Babuska V., Fiala I, Kumazawa M., and Ohno I. (1978). Elastic Properties of Garnet Solid-Solution series. Phys. Earth Planet Int, 16 157-176. 

Cressey G, Schmid R., and Wood B. I (1978). Thermodynamic properties of almandine-grossular garnet solid solutions. Contrib. Mineral Petrol, 67 397-404. 

Ganguly (1976). The energetics of natural garnet solid solution, II Mixing of the calcium silicate end members. Contrib. Mineral Petrol, 55 81-90. 

Ganguly J. and Cheng W. (1994). Thermodynamics of (Ca,Mg,Fe,Mn)-garnet solid solution New experiments, optimized data set, and applications to thermo-barometry. I.M.A., 16th General Meeting (Abstracts)., Pisa, Italy. 

Isaak D. G. and Graham E. K. (1976). The elastic properties of an almandine-spessartite garnet and elasticity in the garnet solid solutions series. J. Geophys. Res, 81 2483-2489. 

Leitner B. I, Weidner D. J., and Liebermann R. C. (1980). Elasticity of single crystal pyrope and implications for garnet solid solution series. Phys. Earth Planet. Interiors., 22 111. 

Newton R. C., Geiger C. A., Kleppa O. J., and Brousse C. (1986). Thermochemistry of binary and ternary garnet solid solutions. I.M.A., Abstracts with Program, 186. 

Akaogi M. and Akimoto S. (1977) Pyroxene-garnet solid-solution equilibria in the systems Mg4Si40i2-Mg3Al2Si30i2 and Fe4Si40i2-Fe3Al2Si30i2 at high pressures and temperatures. Phys. Earth Planet. Inter. 15, 90-106. 

The olivine projection is illustrated in Figure 3.27. This plane contains all the pyroxene solid solutions and the garnet solid solutions. The oUvine-plagiockse piercing point is the point at which the olivine plagioclase join cuts the CS-MS-A... 

Langer, K., Platonov, A.N., and Matsyuk, S.S. (2004) Local mean chromium-oxygen distances in Cr -centered octahedra of natural grossular-uvarovite garnet solid solution from electronic absorption spectra. Z. Kristallogr., 219, 272-277. 

Garnet ferrites, 11 55, 56t, 57 Gamet-hydrogarnet solid solution series, 5 479t... 

Ganguly J. (1979). Garnet and clinopyroxene solid solutions and geothermometry based on Fe-Mg distribution coefficient. Geochim. Cosmochim. Acta, 43 1021-1029. 

Oka Y. and Matsumoto T. (1974). Study on the compositional dependence of the apparent partitioning coefficient of iron and magnesium between coexisting garnet and clinopyro-xene solid solutions. Contrib. Mineral. Petrol, 48 115-121. 

Saxena S. K. (1969). Silicate solid solution and geothermometry. 3. Distribution of Fe and Mg between coexisting garnet and biotite. Contrib. Mineral Petrol, 22 259-267. 

Example 4.1. Suppose olivine and garnet are in contact and olivine is on the left-hand side (x<0). Ignore the anisotropic diffusion effect in olivine. Suppose Fe-Mg interdiffusion between the two minerals may be treated as one dimensional. Assume olivine is a binary solid solution between fayalite and forsterite, and garnet is a binary solid solution between almandine and pyrope. Hence, Cpe + CMg= 1 for both phases, where C is mole fraction. Let initial Fe/(Fe- -Mg) = 0.12 in olivine and 0.2 in garnet. Let Xq = (Fe/Mg)gt/ (Fe/Mg)oi = 3, >Fe-Mg,oi = 10 ° mm+s, and Dpe-Mg,gt =... 

Moore R. O. and Gurney J. J. (1985) Pyroxene solid solution in garnets included in diamond. Nature (London) 318(6046), 553-555. 

Garnet-structure ferrites. Garnet, ideally A3 B2[T04]3, is isometrie (Ia3d) with a straeture built of TO4 tetrahedra and BOe oetahedra linked by shared vertiees that form AOg dodeeahedra. The A-sites aeeommodate divalent (Ca, Mn, Fe) and trivalent (Y, REE) elements. The B-site may contain various di-, tri- (Fe, Al, Ga, Cr, Mn, In, Sc, Co), tetra- (Zr, Ti, Sn, Ru) and even pentavalent elements (Nb, Ta, Sb). The T-sites are filled with tetravalent (Si, Ge, Sn) but may be also occupied by trivalent (Al, Ga, Fe) and pentavalent (P, V, As) elements. Synthetic garnets form multicomponent solid solutions that provide opportunities for incorporating of HEW elements into the structure [149]. 

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