Schieffelinite , Emmonsite Locality: Grand Central Mine, Contention-Grand Central Mine group, Tombstone District, Tombstone Hills, Cochise Co., Arizona, USA White schieffelinite with green emmonsite. Picture width 3 mm. Collection and photograph Christian Rewitzer — Photo: Christian Rewitzer · CC BY-SA 3.0
Schieffelinite
Schieffelinite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Pb₁₀Te⁶⁺₆O₂₀(OH)₁₄(SO₄)(H₂O)₅.
It crystallizes in the orthorhombic crystal system (space group C222_1). It is a member of the Schieffelinite structural group.
Key properties: Mohs hardness 2; specific gravity 4.98; Adamantine luster; optically biaxial.
IMA symbol Sfl, IMA status: approved, named in 1979.
Found in the oxidized zone of tellurium-bearing hydrothermal precious metal deposits.
It is found associated with Rodalquilarite, girdite, bromargyrite, gold, pyrite, empressite, goethite, quartz.
The mineral was named to honor Edward Schieffelin (1847–1897), a discoverer of the mines at Tombstone, Arizona, USA.