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Raman spectrum of three minerals unambiguously identified by their Raman bands. Representative Raman spectrum of graphite (D 1308 cm-1and G 1572 cm-1); anastase (An), with bands at 637, 512, 394, 196 and 145 cm-1and calcite (Cc), 1086, 712, 281 and 157 cm-1recorded at 785 nm laser wavelength. The broad band around 1400 cm-1could not be unambiguously assigned.
