Coyoteite
A hydrated sodium-iron sulfide named for Coyote Peak near Orick, California, where it was discovered.
Intro adapted from Wikipedia (CC BY-SA).
Coyoteite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula NaFe₃S₅·2H₂O.
It crystallizes in the triclinic crystal system.
Key properties: Mohs hardness 1.5; specific gravity 2.5–2.63; Metallic luster.
IMA symbol Coy, IMA status: approved, named in 1978.
With rare iron sulfides in small pegmatitic clots thought to have crystallized late in the consolidation of the Coyote Peak intrusive, an alkalic mafic diatreme.
It is found associated with Pyrrhotite, djerfisherite, rasvumite, bartonite, erdite, phlogopite, schorlomite, acmite, sodalite, cancrinite, pectolite, natrolite, magnetite, calcite.
The name refers to Coyote Peak, California, a local prominence on which the mineral was found.