Mineral Information and Data:

Balkanite
Ag5Cu9HgS8 [CNMNC approved formula]

Named for the locality: Sedmochislenitsi mine, Vratsa district, Balkan Mountains, Bulgaria.

IMA status : Approved Species 1973 (IMA1971-009)
CLASSIFICATION 
Dana
(8th edition) :
02.16.07.01  
  (02) Sulfides - Including Selenides and Tellurides
  (02.16) with miscellaneous formulae
  (02.16.07)
  
Nickel-Strunz
(10th edition) :
02.BD.15
  (02) Sulfides
  (02.B) Metal Sulfides, M:S > 1:1 (mainly 2:1)
  (02.BD) With Hg, Tl
  
Crystal system: Orthorhombic System
Point group (H-M): 222 — disphenoidal
Unit cell: a = 10.62(2) Å, b = 9.42(2) Å, c = 3.92(2) Å
Crystal Habit: As rodlike prismatic crystals, to 0.2 mm, elongated and striated || [001], and in grains, to 3 mm.
Twinning: Lamellar in several directions, common
  
Color: Steel-gray; pale gray in polished section.
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): ~3.5
Measured Density: 6.318 g/cm3
  
Geologic Setting: In high-grade copper ores in a stratiform Pb–Zn–Cu deposit (Sedmochislenitsi deposit, Bulgaria).
Mineral Association: Bornite, chalcocite, chalcopyrite, djurleite, digenite, tennantite, stromeyerite, mckinstryite, wittichenite, bismuth, rammelsbergite, mercurian silver, cinnabar, pyrite, calcite, barite, aragonite.
  

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