The article presents comments on 'A study of the phosphate mineral kapundaite' using SEM/EDX and vibrational spectroscopic methods. Because kapundaite and wardite not only have a different structure but also a different chemistry, it is impossible for them to form a solid solution series, and they do not fall within the same crystal-chemical group of minerals. They present spectroscopic data for crystals whose provenance, quantitative composition and phase identity are all uncertain. In their...[Show more]
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