Mixite
Boss Tweed shaft, Victor Mine, Mammoth, Tintic Mining District, Juab County, Utah, USA
Minerals in the mixite-group have the general formula ACu₆(XO₄)₃(OH)₆·3H₂O, where A = Al, Ca, Y, La, Ce, Nd, Pb or Bi, and X = As or P.
Definitive identification of minerals in this group is nearly impossible based on simple visual inspection, because the needle-like crystals often exhibit zoning along both the a-axis and the c-axis, ...
© Dan A. Polhemus, 2019