Mineral Information and Data:

Ankangite
Ba(Ti,V3+,Cr)8O16 [CNMNC approved formula]

Named for the locality: Shiti Barite deposit, Ankang County, Shaanxi Province, China.

IMA status : Approved Species 1989 (IMA1986-026)
CLASSIFICATION 
Dana
(8th edition) :
07.09.04.02  
  (07) Multiple Oxides
  (07.09)
  (07.09.04)
  
Nickel-Strunz
(10th edition) :
04.DK.05
  (04) Oxides and Hydroxides
  (04.D) Metal:Oxygen = 1:2 and similar
  (04.DK) With large (+- medium-sized) cations; tunnel structures
  
Crystal system: Tetragonal System
Point group (H-M): 4/m — dipyramidal
Unit cell: a = 10.139 Å, c = 2.961 Å
Crystal Habit: Euhedral to subhedral tetragonal prismatic crystals to 0.5 x 0.5 x 1 mm
  
Color: Black
Diaphaneity: Opaque
Luster: Vitreous to adamantine
Hardness (Mohs): 6.5
Measured Density: 4.44 g/cm3
Cleavage: Interrupted perpendicular to elongation, possibly a parting
Tenacity: Brittle
Streak: Grayish black
  
Geologic Setting: In a quartz vein.
Mineral Association: Barite, barytocalcite, roscoelite, diopside
  

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