4.9 oz size
Hausmannite with quartz - considered rare -
Originally named "blattricher Schwarz-Braunstein" in 1813 by Johann Friedrich Ludwig Hausmann,
Professor of Mineralogy, University of Gottingen, Germany (February 22, 1782, Hanover, Germany - December 26, 1859,
Gottingen, Germany). Renamed by Wilhelm Haidinger in 1827
in honor of Hausmann.
ausmannite has a tetragonal distorted spinel structure (due to the Jahn-Teller distortion of the Mn3+-centred polyhedron).
When heated above 1473 K, a cubic high-temperature phase appears (Frenzel 1980).
This rare find from Arkansas
my father found this exploring the area.
** great collector piece CONSIDERED RARE - PRICES USUALLY HIGH - **
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