:Agregados radiales de cristales de rauenthalita incoloros a blancos, transparentes y con brillo. La rauenthalita es un raro arsenato de calcio hidratado. De una localidad irlandesa poco conocida, a excepción de sus mosquitos. Fluorescente bajo UV onda larga Localidad: Muckross Mine, Killarney, Co. Kerry, Irlanda Medidas: 7 x 4 x 2.5 cm. — Photo: Joan Rosell , from rosellminerals.com · CC BY-SA 4.0
Rauenthalite
Rauenthalite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Ca₃(AsO₄)₂·10H₂O.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: specific gravity 2.36; optically biaxial.
IMA symbol Rth, IMA status: approved, named in 1964.
A post-mine low-temperature reaction product of carbonate gangue with arsenical solutions derived from arsenic (Sainte-Marie-aux-Mines, France).
It is found associated with Phaunouxite, picropharmacolite, pharmacolite, sainfeldite, ferrarisite, löllingite, calcite, aragonite (Sainte-Marie-aux-Mines, France); picropharmacolite.
The name refers to the Rauenthal vein system, on which Sainte-Marie-aux-Mines, France, is located.