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Hausmannite
A valid IMA mineral species - grandfathered
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Colour:
Brown-black
Lustre:
Resinous, Sub-Metallic, Dull
Hardness:
5½
Specific Gravity:
4.83 - 4.85
Crystal System:
Tetragonal
Member of:
Name:
Originally named "blättricher Schwarz-Braunstein" in 1813 by Johann Friedrich Ludwig Hausmann, Professor of Mineralogy, University of Göttingen, Germany (February 22, 1782, Hanover, Germany - December 26, 1859, Göttingen, Germany). Renamed by Wilhelm Haidinger in 1827 in honor of Hausmann.
Isostructural with:
Forms a series withhetaerolite.
Hausmannite 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).
Hausmannite generally forms black granular aggregates or, relatively rare, pseudo-octahedral crystals.
May be formed during high-power laser-induced degradation oframsdellite (which, in turn, may form from its variety "groutellite").
Hausmannite 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).
Hausmannite generally forms black granular aggregates or, relatively rare, pseudo-octahedral crystals.
May be formed during high-power laser-induced degradation oframsdellite (which, in turn, may form from its variety "groutellite").
![Mn2+Mn3+2O4](#"/photo-795958.html"><img src="/image.pl?url=https%3a%2f%2fwww.mindat.org%2fimagecache%2fff%2f6c%2f00546630017271923803501.jpg&f=jpg&w=240" alt="00546630017271923803501.jpg" /></a><div><b>Johann F. L. Hausmann</b></div></div></div><div><div><span>Formula:</span><div class=){kind=link}