Abstract
A manganese-bearing mineral characterized by a black hair-like surface crystal growth, and somewhat unique to the Socorro County, New Mexico area, has been referred to as psilomelane (pseudo-pyrolusite). Psilomelane, however, is a hydrated barium manganese oxide, generally A 3 X6Mn8016 (A= B2+, Mn3+, Al3+, Fe3+, S14+, etc. and X=O, OH). Natural psllomelane 1s a smooth, black, uniform or botryoidal mineral possessing an or- thorhombic crystal structure.Large specimens of the hair-like c·rystalline mineral (Fig. 1 (a) were analyzed by X-ray diffraction utilizing Debye-Scherrer nd diffractometer techniques and found to be tetragonal (a=4.42A, c = 2.87A).
Published Version
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