Despujolsite

despujolsite

gaudefroyite

hausmannite

sturmanite

Images

Formula: Ca₃Mn⁴⁺(SO₄)₂(OH)₆.3H₂O
Hydrated sulphate, fleischerite group, manganese-bearing mineral
Crystal System: Hexagonal
Specific gravity: 2.46 measured, 2.52 calculated
Hardness: 2½
Colour: Pale yellow to deep yellow-green
Solubility: Dissolved by hydrochloric acid with release of chlorine, turns brown and then black with dilute nitric acid, not attacked by cold acetic acid
Environments

Metamorphic environments
Hydrothermal environments

Localities

At the type locality, the Tachgagalt Mine, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco, despujolsite occurs in aggregates of lemon-yellow hexagonal prisms up to 0.5 mm long in the hydrothermal manganese deposit. Associated minerals include gaudefroyite (AM 54.326-330, Mindat).

At the N'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa, despujolsite has been found on hausmannite. Associated minerals, not in the photograph, include, andradite, baryte, sturmanite, and a white unknown mineral (probably oyelite). (Mindat photo).
Despujolsite from the N'Chwaning II Mine - Image

At the N'Chwaning III Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa, despujolsite has been found (Mindat photo).
Despujolsite from the N'Chwaning III Mine - Image

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