Three unfrequent minerals from the Sosedka pegmatite, Malkhan, Zabaykalsky, Russia. Malkhan is known for its beautiful red tourmalines. But it is also produces polylithionite. It is accompanied by a powdery mass of boromuscovite and borocoockeite. Boron replaces here the aluminium in the silicate lattice. UV-C @275 nm
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