Mineral Information and Data:

Hausmannite
Mn2+Mn3+2O4 [CNMNC approved formula]

Named in honor of Johan Friedrich Ludwig Hausmann (1782–1859), Professor of Mineralogy, University of Göttingen, Göttingen, Germany.

IMA status : Valid species (Pre-IMA 1828) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
07.02.07.01  
  (07) Multiple Oxides
  (07.02) (A+ B++)2 X4 Spinel group
  (07.02.07)
  
Nickel-Strunz
(10th edition) :
04.BB.10
  (04) Oxides and Hydroxides
  (04.B) Metal:Oxygen = 3:4 and similar
  (04.BB) With only medium-sized cations
  
Crystal system: Tetragonal System
Point group (H-M): 4/mmm (or 4/m 2/m 2/m) — ditetragonal-dipyramidal
Space group: I41/amd
Unit cell: a = 5.76Å, c = 9.46Å
Crystal Habit: Crystals are pseudo-octahedral and striated || [100], to 7.5 cm. Commonly granular or massive.
Twinning: Repeated twins on {112}, producing fivelings or lamellar intergrowths
  
Color: Dark brown to black; deep reddish brown in transmitted light; gray in reflected light, with deep blood-red to reddish brown internal reflections
Diaphaneity: Opaque, transparent through thin edges
Luster: Submetallic
Hardness (Mohs): 5.5
Measured Density: 4.84 g/cm3
Cleavage: {001}, perfect; {112} and {011}, indistinct
Tenacity: Brittle
Fracture: Uneven
Streak: Dark reddish brown
  
Geologic Setting: A primary mineral in hydrothermal veins. Also produced by metamorphism of manganiferous rocks.
Mineral Association: Rhodochrosite, pyrolusite, jacobsite, braunite, andradite, barite
  

 

Hausmannite
Black, lustrous, pseudo-octahedral crystals to 6 mm and less throughout matrix associated with white barite and red garnet.
Origin: Wessels mine, Northern Cape Province, South Africa
Sample size: 6 x 5 x 3 cm
Photo: Tom Loomis

 

Hausmannite
(zoom-in of above)

<<< BACK TO MINERAL SEARCH