Composition: Fe2+Ge4+(OH)6
Crystal System : Tetragonal
Lustre : Greasy
Hardness : 4.5
Specific Gravity : 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)


  • 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.