From a garnetite in a tin-bearing skarn, formed under conditions of relatively low temperature and low (XCO2).
Approved IMA 1981
On the west bank of the Beht River, near El Hamman, central Morocco. Link to MinDat.org Location Data.
For Dr. Donald McLain Burt (1943- ), Professor of Mineralogy, Arizona State University, Tempe, Arizona, USA, authority on mineral equilibria and greisen deposits, who had predicted the natural occurrence of the compound