Coyoteite

Coyoteite
General
CategorySulfide mineral
Formula
(repeating unit)		(NaFe3S5·2H2O)
IMA symbolCoy[1]
Strunz classification2.FD.25
Dana classification02.14.06.01
Crystal systemTriclinic
Unknown space group
Identification
Colorblack
Crystal habitIrregular grains - occurs as splotchy, anhedral crystals forming inclusions in other minerals
Cleavage{111} Perfect
Mohs scale hardness1-1.5
LusterMetallic
Streakblack
DiaphaneityOpaque
Specific gravity2.5 - 2.62 measured; 2.879 calculated
PleochroismFaint, from gray to pink
Other characteristicsModerately magnetic
References[2][3][4][5]

Coyoteite is a hydrated sodium iron sulfide mineral. The mineral was named coyoteite after Coyote Peak near Orick, California, where it was discovered (along with another rare mineral, orickite).[2]

This mineral is unstable under normal atmospheric conditions, making it rare at the surface. The mineral was first described in a petrographic study of a sample of a mafic diatreme at Coyote Peak. The largest piece of coyoteite found on that specimen has the dimensions of 0.2 × 0.4 mm.[2]

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b c Erd, Richard C.; Czamanske, Gerald K. (1983). "Orickite and coyoteite, two new sulfide minerals from Coyote Peak, HunboldtCountry, California" (PDF). American Mineralogist. 68: 245–254.
  3. ^ V. Pekov, A.A. Agakhanov (2007). Thallium-Rich Murunskite from the Lovozero Pluton, Kola Peninsula, and Partitioning of Alkali Metals and Thallium between Sulfide Minerals. Vol. 4. Zapiski Rossiskogo Mineralogicheskogo Obshchestva. pp. 74–78.
  4. ^ Evans, J.R.; Allmann, R. (1968). The crystal structure and crystal chemistry of Valleriite. Vol. 127. Zeitschrift flir Kristallographie, Bd. pp. 73–93.
  5. ^ Anthony, J. W., Bedeaux, R., Bladh, K. and Nicholas, M. (1990). Handbook of Mineralogy (PDF). Vol. 1. Mineral Data Publishing (Republished by the Mineralogical Society of America).{{cite book}}: CS1 maint: multiple names: authors list (link)