Mineral Information and Data:

Bannermanite
Na0.7V6O15 [CNMNC approved formula]

Named for Harold M. Bannerman (1897-1976), U. S. Economic Geologist.

IMA status : Approved Species 1983 (IMA1980-010)
CLASSIFICATION 
Dana
(8th edition) :
47.03.05.01  
  (47) Vanadium Oxysalts
  (47.03) (Hydrated)
  (47.03.05)
  
Nickel-Strunz
(10th edition) :
04.HF.05
  (04) Oxides and Hydroxides
  (04.H) V[5+,6+] Vanadates
  (04.HF) No group assigned
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 15.413Å, b = 3.615Å, c = 10.066Å; β = 109.29°
Crystal Habit: As incrustations of subhedral to euhedral lathlike crystals, flattened on {001} and elongated along [010], up to 250 μm.
  
Color: Black; light brown on thin edges in transmitted light.
Diaphaneity: Opaque, transparent on thin edges
Luster: Sub-Metallic
Measured Density: 3.5(2) g/cm3
Cleavage: {100}, perfect; {010}, fair
Tenacity: Brittle
Streak: Dark gray-black
  
Geologic Setting: In vanadium-bearing sublimates in fumaroles on a basaltic volcanic cone.
Mineral Association: Shcherbinaite, stoiberite, ziesite, fingerite, chalcocyanite, chalcanthite
  

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