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Uvarovite: Stability of uvarovite-andradite solid solutions at low pressure

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Abstract

Uvarovite (Ca3Cr2Si3O12) forms a complete solid solution series with andradite (Ca3Fe +32 Si3O12) below 1,137±5 ° C at a total pressure of 1 atm. Pure uvarovite decomposes to pseudowollastonite (CaSiO3)+eskolaite (Cr2O3) at 1,385 ± 10 ° C. The incorporation of Ca3Fe +32 Si3O12 component in the uvarovite structure lowers the thermal stability of the garnet. The breakdown assemblage is garnetss (Ca3(Cr,Fe+3 2)Si3O12)+pseudowollastonite (CaSiO3)+hemeskolaitess(Cr,Fe+3O3). Pure andradite decomposes to pseudowollastonite (CaSiO3)+hematite (Fe2O3) at 1,137±5 °C. Andradite thermal stability is increased by incorporation of Ca3Cr2Si3O12 component by 248 °C.

At 1,264±5 °C pseudowollastonite+hematite react to liquid defining a thermal minimum of the CaSiO3-Cr2O3-Fe2O3 ternary system. This minimum is located at about 64.5 wt.-% CaSiO3, 0.5 wt.-% Cr2O3, and 35.0 wt.-% Fe2O3. Uvarovite and andradite bulk compositions start to melt at 1,420 °C and 1,265 ±5 °C, respectively.

The unit-cell parameter for uvarovite is 11.999 (2) Å, the refractive index 1.866 (2). The substitution of Cr+3 by Fe+3 increases a and n almost linearly toward the andradite end member which displays a unit-cell parameter of 12.059 (3) Å and a refractive index of 1.887 (2).

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Authors and Affiliations

  1. Mineralogisch-Petrographisches Institut der Universität München, Theresienstr. 41, D-8000, München 2, Federal Republic of Germany

    H. G. Huckenholz & D. Knittel

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  1. H. G. Huckenholz
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  2. D. Knittel
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Huckenholz, H.G., Knittel, D. Uvarovite: Stability of uvarovite-andradite solid solutions at low pressure. Contr. Mineral. and Petrol. 56, 61–76 (1976). https://doi.org/10.1007/BF00375421

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