Abstract
Deerite, Fe 2+12 Fe 3+6 [Si12O40](OH)10, thus far known from ten localities in glaucophane schist terranes, was synthesized at water pressures of 20–25 kb and temperatures of 550–600 °C under the\(f_{O_2 } \) of the Ni/NiO buffer. The X-ray powder diagram, lattice constants and infrared spectrum of the synthetic phase are closely similar to those of the natural mineral. A solid solution series extends from this ferri-deerite end member to some 20 mole % of a hypothetical alumino-deerite, Fe 2+12 Al 3+6 [Si12O40](OH)10. The upper temperature breakdown of ferri-deerite to the assemblage ferrosilite +magnetite+quartz+water occurs at about 490 °C at 15 kb, and 610 °C at 25 kb fluid pressure for the\(f_{O_2 } \) of the Ni/NiO buffer. Extrapolation of these data to lower water pressures indicates that deerite can be a stable mineral only in very low-temperature, high-pressure environments.
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Langer, K., Lattard, D. & Schreyer, W. Synthesis and stability of deerite, Fe 2+12 Fe 3+6 [Si12O40](OH)10, and Fe3+⇋Al3+ substitutions at 15–28 kb. Contr. Mineral. and Petrol. 60, 271–297 (1977). https://doi.org/10.1007/BF01166801
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DOI: https://doi.org/10.1007/BF01166801