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Nagelschmidtite: Ca7(SiO4)3(PO4)2
Comments: Upper - Transmitted light thin sections showing honey-brown nagelschmidtite. Lower - reflected light polished section showing nagelschmidtite (Nag), rankinite (Ran), Ti-rich androdite (Andr). Location: Andradite-rich pegmatoid rock, Haturim Basin, Negev Desert, Israel. Scale: See Images. © Diederik Visser