Satterlyite from the Rapid Creek area of northern Yukon , Canada. Held in the A. E. Seaman Mineral Museum . — Photo: Chris857 · CC BY-SA 3.0
Satterlyite
A hydroxyl-bearing iron phosphate of phosphatic shales, first found along Yukon's Big Fish River.
Intro adapted from Wikipedia (CC BY-SA).
Satterlyite is an IMA-recognized mineral species in the phosphate class, with the chemical formula (Fe²⁺,Mg,Fe³⁺)₁₂(PO₃OH)(PO₄)₅(OH,O)₆.
It crystallizes in the hexagonal crystal system (space group P31m). It is a member of the Holtedahlite structural group.
Key properties: Mohs hardness 4.5–5; specific gravity 3.68; Pale yellow streak; Vitreous luster; refractive index 1.72; optically uniaxial.
IMA symbol Sly, IMA status: approved, named in 1976.
Found in nodules in shales.
It is found associated with Quartz, pyrite, wolfeite, marićite.
The mineral was named to honor Dr. Jack Satterly (1906–1993), geologist, Ontario Department of Mines and Royal Ontario Museum, Toronto, Canada.