Creaseyite , Mimetesite , Pyromorphite (FOV: 3 x 2 mm aprox) Locality: Soga quarry, Camiña, Pampa del Tamarugal, Iquique Province, Tarapacá Region, Chile Original description: A unique combination of light smooth green tiny acicular (1-2 mm. across) Creaseyite xls (analysed by Dr. J. Schluter), growed on orange-yellow Mimetite xls, and some white Pyromorphite grains: on right wing tip, massive bluish Chrysocolla — Photo: Arturo Molina · CC BY 3.0
Creaseyite
Creaseyite is an IMA-recognized mineral species in the silicate class, with the chemical formula Cu₂Pb₂Fe³⁺₂Si₅O₁₇·6H₂O.
It crystallizes in the orthorhombic crystal system.
Key properties: Mohs hardness 2.5; specific gravity 4.1; Light green streak; optically biaxial.
IMA symbol Cse, IMA status: approved, named in 1974.
Found in the oxidized zone of a base-metal deposit, in andesite breccia loosely cemented with iron oxides and wulfenite (Tiger, Arizona, USA).
It is found associated with Mimetite, dioptase, fluorite, willemite, wulfenite, descloizite, murdochite (Tiger, Arizona, USA); ajoite, fluorite (Potter-Cramer property, Arizona, USA).
The mineral was named to honor Dr. Saville Cyrus Creasey (1917{), economic geologist, U.S. Geological Survey, expert on Arizona mineral deposits.