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American Mineralogist; June 1983; v. 68; no. 5-6; p. 634-641
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Bannermanite, a new sodium-potassium vanadate isostructural with beta -Na x V 6 O 15

John M. Hughes, and Larry W. Finger

Dartmouth Coll., Dep. Earth Sci., Hanover, NH, United States
Carnegie Inst. Washington, United States

Occurs as black subhedral to euhedral crystals in the oxide zone of a fumarole at Izalco Volcano, El Salvador. Bannermanite is monoclinic, space group C2/m, with a = 15.413(7), b = 3.615(2), c = 10.066(8) angstrom, beta = 109.29(8) degrees , Z = 2,D(obs) = 3.5+ or -0.2 g/cm 3 , and D(calc) = 3.55 g/cm 3 . The crystal structure of bannermanite has been refined to wR = 0.074. Bannermanite transmits light on thin edges, with a mean index of refraction of 2.2. The mineral has two cleavages, (h0l) and (0kl), and a dark gray-black streak.--Modified journal abstract.

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