Söhngeite Locality: Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto Region (Oshikoto), Namibia Picture width 6.5 mm. Collection and photograph Christian Rewitzer — Photo: Christian Rewitzer · CC BY-SA 3.0
Söhngeite
Söhngeite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Ga(OH)₃.
It crystallizes in the orthorhombic crystal system (space group Pmn2_1). It is a member of the Perovskite structural group.
Key properties: Mohs hardness 4–4.5; specific gravity 3.84.
IMA symbol Söh, IMA status: approved, named in 1965.
An alteration product of gallite-bearing germanite in an oxidation zone of a dolostone-hosted hydrothermal polymetallic ore deposit.
It is found associated with Germanite, gallite.
The mineral was named to honor Dr. A.P.G. Söhnge, formerly Chief Geologist, Tsumeb Corporation, Tsumeb, Namibia.