Abstract
Single-crystal Raman spectra of synthetic end-member uvarovite (Ca3Cr2Si3O12) and of a binary solution (59% uvarovite, 41% andradite) have been measured using single crystal techniques. For each of these garnets, 22 and 21 of the 25 Raman modes were located, respectively. The spectra for uvarovite garnets closely resemble those of the other calcic garnets, grossular, and andradite. The modes for uvarovites do not fit into the same trends as established by the other five anhydrous end-member garnets: the high energy “internal” Si–O modes do not depend on lattice constant in uvarovite. They exceed frequencies for both andradite and grossular. This is likely due to the large crystal field stabilization energy of trivalent chromium. The low energy and midrange modes are at similar frequencies to the other calcic garnets.
Similar content being viewed by others
References
Bass JD (1986) Elasticity of uvarovite and andradite garnets. J Geophys Res 91:7505–7516
Chopelas A (1996) Thermal expansivity of lower mantle phases MgO and MgSiO3 perovskite at high pressure derived from vibrational spectroscopy. Phys Earth Planet Int 98:3–15
Chopelas A (2000) Thermal expansivity of mantle relevant magnesium silicates from vibrational spectroscopy at high pressures. Am Mineral 85:270–278
Chopelas A, Boehler R, Ko J (1994) Thermodynamics and behavior of γ-Mg2SiO4 at high pressure: Implications for Mg2SiO4 phase equilibrium. Phys Chem Minerals 21:351–359
Fateley WG, McDevitt NT, Bently FF (1971) Infrared and Raman selection rules for lattice vibrations: the correlation method. App Spec 25:155–174
Hofmeister AM, Chopelas A (1991a) Thermodynamic properties of pyrope and grossular from vibrational spectroscopy. Am Mineral 76:880–891
Hofmeister AM, Chopelas A (1991b) Vibrational spectroscopy of end-member silicate garnets. Phys Chem Miner 17:503–526
Kolesnik YN, Yachmenev VY, Vilkovskiy VA, Vishnevskiy AA (1994) Heat capacity of 2–300 K temperature range and entropy of chromium-bearing garnets. Geokhimiya 1994:89–100
Kolesov BA, Geiger CA (1998) Raman spectra of silicate garnets. Phys Chem Miner 25:142–151
Moore RK, White WB (1971) Vibrational Spectra of the Common Silicates: I. The Garnets Am Miner 56:54–71
Pinet M, Smith DC (1993) La microspectrometrie Raman des grenats X3Y2Z3O12; I, La serie calcique naturelle ouvarovite-grossulaire-andradite. Schweizerische Mineralogische und Petrographische Mitteilungen = Bulletin Suisse de Mineralogie et Petrographie 73:21–40
Pinet M, Smith DC (1994) La microspectrometrie Raman des grenats X3Y2Z3O12; II, La serie alumineuse naturelle pyrope-almandin-spessartite. Schweizerische Mineralogische und Petrographische Mitteilungen = Bulletin Suisse de Mineralogie et Petrographie 74:161–179
Savage FS, Chopelas A (2002) Single crystal Raman spectroscopy and thermodynamics of garnet solid solutions I: grossular–andradite. EOS Trans Am Geophys U (abstract)
Savage FS, Chopelas A (2003) Single crystal Raman spectroscopy and thermodynamics of garnet solid solutions II: pyrope–almandine binary. EOS Trans Am Geophys U (abstract)
Acknowledgments
I thank A.M Hofmeister for the samples and valuable discussion and F. Savage for help in the lab. This research was supported by NSF grant EAR-0296205
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Chopelas, A. Single crystal Raman spectrum of uvarovite, Ca3Cr2Si3O12 . Phys Chem Minerals 32, 525–530 (2005). https://doi.org/10.1007/s00269-005-0014-5
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00269-005-0014-5