Mineral Information and Data:

Balyakinite
Cu2+Te4+O3 [CNMNC approved formula]

Named to honor Tat’yana Stepanovna Balyakina (1906-1986), Geology Instructor, Moscow University, Moscow, Russia.

IMA status : Approved Species 1980 (IMA1980-001)
CLASSIFICATION 
Dana
(8th edition) :
34.01.03.01  
  (34) Selenites - Tellurites - Sulfites
  (34.01) as A++ XO3
  (34.01.03)
  
Nickel-Strunz
(10th edition) :
04.JK.15
  (04) Oxides and Hydroxides
  (04.J) Arsenites, Antimonites, Bismuthites, Sulfites,
  (04.JK) Tellurites without additional anions, without H2O
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
Unit cell: a = 7.6Å, b = 12.7Å, c = 5.83Å
Crystal Habit: As minute short prismatic crystals, and as grains, to 0.5 mm.
  
Color: Grayish green, bluish green, blue to pale blue; in reflected light, gray, bluish gray
Diaphaneity: Semitransparent
Measured Density: 5.6 g/cm3
Streak: Pale bluish green
  
Geologic Setting: A rare mineral formed in the oxidation zone as an alteration product of Cu–Te sulfides.
Mineral Association: Tetrahedrite, chalcopyrite, tellurite, bilibinskite, bogdanovite, teineite, quartz (Aginsk deposit, Russia).
  

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