Philrothite
Philrothite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula TlAs₃S₅.
It crystallizes in the monoclinic crystal system (space group P2_1/c). It is a member of the Sartorite structural group.
Key properties: Mohs hardness 3–3.5; specific gravity 4.635; Dark brown streak; Metallic. Bireflectance: Moderate luster.
IMA symbol Phr, IMA status: approved, named in 2013.
A product of late-stage Tl- and As-bearing hydrothermal solutions during alpine metamorphism.
It is found associated with Realgar, smithite, rutile, sartorite.
The mineral was named to honor Philippe Roth (b. 1963), President of the FGL (Forschungsgemeinschaft Lengenbach) and an expert on Lengenbach minerals.
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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