Genplesite is a very rare tin mineral[2] coming from the Oktyabr'skoe deposit in the Noril'sk area, Russia, which is known for nickel and platinum group elements minerals.
[2][3] Genplesite is a member of the fleischerite group,[2] and it is a calcium and tin-analogue of fleischerite.
[5] It is hexagonal, with space group P63/mmc.
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