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Bystrite: (Na,K)7Ca(Si6Al6)O24S4.5·(H2O) Lazulite: MgAl2(PO4)2(OH)2
Comments: Brownish-yellow bystrite grains with blue lazulite in an igneous rock. Location: Malo-Bystrinskoye lazurite deposit, Tunka Valley, Sludyanka, Lake Baikal Region, Russia. Scale: Picture size 7 mm. © Thomas Witzke / Abraxas-Verlag