Jáchymovite
Jáchymovite is an IMA-recognized mineral species in the sulfate class, with the chemical formula (UO₂)₈(SO₄)(OH)₁₄·13H₂O.
It crystallizes in the monoclinic crystal system.
Key properties: specific gravity 4.79; Pale yellow streak; Vitreous luster; optically biaxial.
IMA symbol Jác, IMA status: approved, named in 1994.
Found on a museum specimen from the heavily oxidized portions of a uraninite-bearing vein in dolomite.
It is found associated with Gypsum, uranopilite, uraninite.
The name refers to the uranium deposit at Jáchymov, Czech Republic, where the specimen was collected.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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