A Review of the mineralogical opal classification
Neville Curtis and colleagues discuss an update from their investigations and experimental data for the mineralogical aspects of Opal-A (Opal-AG, Opal-AN), Opal-CT and Opal-C by X-ray Diffraction, Infrared Spectroscopy, Raman Spectroscopy and NMR (Nuclear Magnetic Resonance. The group analysed over 230 opal samples from world wide sources.
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