Polylithionite, boromuscovite and borocoockeite.
- groensteenfreterke
- Jun 23, 2022
- 1 min read

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