In a paper (Camacho-Lopez et al. 2013), I found the following sentence: “To our knowledge, the Raman spectrum for SnO2 in its orthorhombic phase has not been reported yet.”
The answer is given in the following:
Thomas, R. (2023) Unusual cassiterite mineralization, related to the Variscan tin-mineralization of the Ehrenfriedersdorf deposit, Germany
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