Stottite

Stottite


Composition: Fe2+Ge4+(OH)6
Crystal System : Tetragonal
Colours: Yellow-brown, sherry-brown, red-brown
Lustre : Greasy
Hardness (H) : 4.5
Specific Gravity (S.G) : 3.6
Year of Discovery: 1958
IMA Number: 1958
IMA Status: Grandfathered
Discovered By: Friedrich Gramatzki (Tsumeb miner)
Named for: Charles Stott (Tsumeb general manager)
References: Strunz et al. (1958b)

Tsumeb is the Type Locality

Distribution

Very rare. Second oxidation zone.

Occurrence

  • Supergene
  • 2nd Oxidation Zone

Notable Finds

The type specimen is from 30 Level. Subsequent discoveries were made in the 1960s, 70s, and 80s on 29, 30, and 31 Levels, essentially the middle portion of the second oxidation zone.

Paragenetic and General Notes

Stottite occurs as pseudo-octahedral crystals and anhedral masses in germanium-rich sulphide ores. Exceptional crystals to 20 mm are known. Associated minerals are zincian siderite, quartz, ludlockite, leiteite, and schneiderhöhnite.

Cesbron et al. (1977) has suggested that reinerite is also part of the same paragenesis. The close association of stottite with three, and perhaps four, zinc arsenites suggests that it forms under somewhat reducing conditions (Southwood, 2015).

Stottite is readily confused with siderite, wulfenite, stolzite, or even scheelite.