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Metamorphosed carbonatites, located in the Basal Complex of Fuerteventura, Canary Islands (Spain), contain unusual Ca-Nb-Zr disilicates. These mineral phases appear in different textural situations that have very different chemical compositions. More widespread Ca-Nb disilicates with minor Zr contents cover the whole range of cuspidine–niocalite solid solution. Disilicate crystals containing more...
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