Riomarinaite
Riomarinaite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Bi(SO₄)(OH)·H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/n).
Key properties: Mohs hardness 2–3; specific gravity 4.8; White to light gray streak; Vitreous luster.
IMA symbol Rmr, IMA status: approved, named in 2000.
A weathering product from the decomposition of bismuthinite and cosalite.
It is found associated with Bismoclite, bismutite, cannonite, anglesite, hydroniumjarosite, plumbojarosite.
The name refers to the mine that yielded the first specimens.
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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