Museumite
Museumite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula [Pb₂(Pb,Sb)₂S₈][(Te,Au)₂].
It crystallizes in the monoclinic crystal system.
Key properties: Mohs hardness 1–1.5; specific gravity 9.04; Gray-black streak; Metallic. Bireflectance: Very low luster.
IMA symbol Mus, IMA status: approved, named in 2003.
Fills cavities and vugs in nagyágite with which its contacts are sharp with evidence of replacement. Found on a museum specimen from a hydrothermal gold-telluride deposit.
It is found associated with Nagyágite, hessite, sylvanite, petzite, coloradoite, calcite, quartz.
The mineral was named to honor all museums in the world that preserve their old samples with care and accuracy.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
Browse more M minerals or help write this entry.