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Bannermanite

• Formula:
  (Na,K)_0.7V⁴⁺_0.7V⁵⁺_5.3O₁₅

• System: Monoclinic

• Name:
  For Dr. Harold MacColl Bannerman (1897-1976), American economic geologist, U.S. Geological Survey and Dartmouth College, Hanover, New Hampshire, USA.

• IMA Status: Valid (Approved)

• Type Locality:
  Izalco Volcano, Sonsonate Department, El Salvador

• Dana 8th: 47.3.5.1
  
  47 : VANADIUM OXYSALTS
  3 : Hydrated Normal Vanadium Oxysalts

• Density: 3.5 g/cm³ (measured)
  3.55 g/cm³ (calculated)

• Lustre: Sub-Metallic

• Diapheny: Opaque

• Diapheny: brittle

• Colour: Black, light brown on thin edges in transmitted light

• Streak: Dark grey-black