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Hausmannite (Photo) [abbr. Hsm ]

Year of discovery: 1827 (Öhrenstock, Germany), 1944 (Japan)

Locality list: 244 localities of hausmannite

• MnMn₂O₄, Mn₃O₄
• [Mn²⁺][Mn³⁺₂][O₄]^8-

• Class: Spinel subgroup < Oxyspinel group < Spinel supergroup
• Class: Oxide
• Soluble in: HCl (with Cl₂ bubbles)
• Magnetism: Paramagnetic

• Mn²⁺ => Zn: Hetaerolite

• Mn³⁺ => Fe: Jacobsite
• Mn³⁺ => Al: Galaxite
• Mn³⁺ => Cr: Manganochromite
• Mn³⁺ => V: Vuorelainenite

• Color: Dark brown-Black
• Streak: Dark brown
• Luster: Sub-Metallic
• Diaphaneity: Opaque

• Habit: Octahedral, Fine grains

• Cleavage: Perfect on {001} (1 plane), Indistinct on {112} and {011} (6 planes)
• Hardness: 5.5
• Density: 4.8

• System: Tetragonal
• Group: 4/mmm, I4₁/amd
• Lattice: a=5.8, c=9.5

• Non-coexist: Quartz

Etymology: J. F. L. Hausmann, German mineralogist