Despujolsite Locality: N'Chwaning III Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province , en:South Africa ( Locality at mindat.org ) A rare matrix specimen, one of only a few recovered when the miners scraped out this pocket. It has a dozen good crystals, many to 1 cm, on manganese gangue matrix. This is the richest single specimen we know of from the find, to date. Collected in the summer of 2010. Analyzed by Dr. Robert Downs at the University of Arizona. 1.8 x 1.7 x 0.6 cm. — Photo: Robert M. Lavinsky · CC BY-SA 3.0
Despujolsite
Despujolsite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Ca₃Mn⁴⁺(SO₄)₂(OH)₆·3H₂O.
It crystallizes in the hexagonal crystal system (space group P-62c). It is a member of the Fleischerite structural group.
Key properties: Mohs hardness 2.5; specific gravity 2.46; Vitreous luster; optically uniaxial.
IMA symbol Dpj, IMA status: approved, named in 1967.
Found in a hydrothermal manganese deposit.
It is found associated with Gaudefroyite.
The mineral was named to honor Pierre Despujols (1888–?), founder of the Moroccan Geologic Survey.