Mineral Information and Data:

Bazhenovite
Ca8S5(S2O3)(OH)12 • 20H2O [CNMNC approved formula]

Named for A. G. Bazhenov (petrographer) and L. F. Bazhenov (analytical chemist), Russian scientists.

IMA status : Approved Species 1987 (IMA1986-053)
CLASSIFICATION 
Dana
(8th edition) :
29.09.03.01  
  (29) Hydrated Acid and Sulfates
  (29.09) with miscellaneous formulae
  (29.09.03)
  
Nickel-Strunz
(10th edition) :
02.FD.50
  (02) Sulfides
  (02.F) Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O
  (02.FD) With O, OH, H2O
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Space group: P21/b
Unit cell: a = 8.45Å, b = 17.47Å, c = 8.24Å; β = 119.5°
Crystal Habit: As bladed or platy crystals, to 5 mm, showing {110}, {011}, {101}, and {111}, flattened on {010}, elongated along [001]; in aggregates, to 1 cm.
  
Color: Orange to yellow
Diaphaneity: Transparent in thin crystals, translucent in aggregates
Luster: Vitreous, pearly on intergrowths of parallel plates
Hardness (Mohs): 2
Measured Density: 1.83 g/cm3
Cleavage: {010}, very good
Tenacity: Brittle but elastic
Fracture: Uneven
Streak: Pale yellow
  
Geologic Setting: Among the melt products of old, burning coal dumps.
Mineral Association: Siderite, pyrite, iron, sulfur, oldhamite, portlandite, periclase, troilite, pyrrhotite, fluorite.
  
Other Properties: H2O Soluble.
Comments: Hydrolyzes in air, with sulfur evident in the residue.

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