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Karupmollerite-Ca: (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4·7(H2O)
Comments: Small white fragment of kaupmollerite-Ca in a geletin capsule. Location: Mellemelv, Ilimaussaq, Greenland. Scale: Capsule Size 1 cm. © Sergey Vasiliev / Systematic Mineralogy