Composition: Ga(OH)3
Crystal System : Orthorhombic (pseudo-cubic)
Colours: Cream, beige, brown
Lustre : Sub-vitreous
Hardness (H) : 4
Specific Gravity (S.G) : 3.84
Year of Discovery: 1965
IMA Number: 1965-022
IMA Status: Approved
Discovered By: Sidney Pieters (Namibian dealer)
Named for: P.G. (Gerry) Söhnge (Tsumeb geologist)
References: Strunz (1965)

Tsumeb is the Type Locality


Very rare. Second oxidation zone.


  • Supergene
  • 2nd Oxidation Zone

Notable Finds

Pinch and Wilson (1977) record that crystals up to c. 8 mm were found, from "the 900 and 1100 m levels" (= 30 Level and 36 Level).

Paragenetic and General Notes

Söhngeite occurs in aggregates of twinned crystals, in which the individuals present with a characteristic perpendicular orientation. Very rarely söhngeite occurs without this twinning; a single specimen is known with untwinned pseudo-cubic crystals (Gebhard, 1999). 

On the type specimen söhngeite occurs in tiny cavities in germanite / gallite rich sulphide ore.