The low-temperature heat capacity of uvarovite (Ca 3 Cr 2 Si 3 O 12 ) was measured between 2 and 400 K, and thermochemical functions were derived from the results. The measured heat-capacity curve shows a significant lambda-shaped anomaly peaking at around 9 K. The nature of this transition is unknown. From our data, we suggest a standard entropy for uvarovite at 298.15 K of 320.9 ± 0.6 J/(mol·K).
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Stephan Klemme (2005) studied this question.
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