Mineral Information and Data:

Bartonite
K6Fe20S26S [CNMNC approved formula]

Named for Paul B. Barton, Jr., sulfide petrologist with the U.S. Geological Society.

IMA status : Approved Species 1981 (IMA1977-039)
CLASSIFICATION 
Dana
(8th edition) :
02.09.19.01  
  (02) Sulfides - Including Selenides and Tellurides
  (02.09) where Am Bn Xp, with (m+n):p=1:1
  (02.09.19) Bartonite Group
  
Nickel-Strunz
(10th edition) :
02.FC.10
  (02) Sulfides
  (02.F) Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O
  (02.FC) With Cl, Br, I (halide-sulfides)
  
Crystal system: Tetragonal System
Point group (H-M): 4/mmm (or 4/m 2/m 2/m) — ditetragonal-dipyramidal
Space group: I4/mmm
Unit cell: a = 10.424(1) Å, c = 20.626(1) Å
Crystal Habit: Anhedral masses, intergrown with pyrrhotite; rare elongated single crystals, to 50 μm long.
  
Color: Blackish brown; in polished section, yellowish green-gray to yellowish green-brown
Diaphaneity: Opaque
Luster: Submetallic
Hardness (Mohs): 3.5
Measured Density: 3.305 g/cm3
Cleavage: {112}, distinct
Fracture: Conchoidal
Streak: Black
  
Geologic Setting: In clots with other sulfides and silicates in an alkalic diatreme which intruded Franciscan rocks.
Mineral Association: Rasvumite, djerfisherite, erdite, pyrrhotite, pyrite, sphalerite, lollingite, magnetite, nepheline, phlogopite
  
Other Properties: Paramagnetic (weakly attracted to magnetic fields).

 

Bartonite
Brownish black bartonite with submetallic luster.
Origin: Coyote Peak, Orick, Humboldt County, California, USA.
Mineral identification has been confirmed by single-crystal X-ray diffraction.
Photo: © RRUFF Project

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