Formula: NaF3S5 . 2H2O
Origin of name: From Locality, near Coyote Peak, California, a local prominence that gives its name to the U.S.G.S. 15 minute quadrangle map of the area.
Crystal system: Triclinic
Crystal class: 1 or -1
Twinning:
Unit cell: a = 7.409 Å, b = 9.881 Å, c = 6.441 Å, α = 100°23', β = 104°37', g = 81°29'
Colour: Black
Diaphaneity:
Luster: Metallic
Habit: Microscopic grains
Hardness: 1.5
Specific gravity: 2.879
Cleavage: 1; {-1-11} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: Moderately magnetic. Found with rare iron sulphides in small pegmatitic clots thought to have crystallised late in the consolidation of the Coyote Peak intrusive, a mafic alkalic diatreme.
| Back to Alphabetical list | Colour photos | Optical properties/Thin sections | SEM images | TEM images | vibrational spectra description | IR spectra | Raman spectra | N-IR spectra | F-IR spectra | IES spectra |