Rossiantonite
Rossiantonite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Al₃(PO₄)(SO₄)₂(OH)₂(H₂O)₁₀·4H₂O.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: specific gravity 1.958; White streak; Vitreous luster.
IMA symbol Ran, IMA status: approved, named in 2012.
Found in the porosity of fine-grained sand, filling spaces between boulders of weathered quartz sandstone.
It is found associated with Gypsum, sanjuanite, alunite, quartz, micro-spherules of amorphous silica.
The mineral was named to honor Antonio Rossi (1942-2011), professor of Sedimentary Petrology at Modena and Reggio Emilia University and an early developer of scientific speleology in Italy.
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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