Mineralpedia Details for Diadochite

Named after its formation as a secondary mineral from earlier phosphates after the Greek word diadochos, meaning “successor.” Diadoshite is an uncommon mineral that may be post-mine in origin and can be found in gossans and coal deposits formed from sulfate rich solutions, as well as in caves with the phosphate derived from guano, and in granite pegmatites. Localities for Diadochite include in Germany, Belgium, the Czech Republic, France, Slovakia, Austria, Canada, and in the USA including here in the Black Hills of South Dakota in the Tip Top and Big Chief mines. Other additional localities are known.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/diadochite.pdf

Formula

Fe³⁺₂(PO₄)(SO₄)(OH)·6H₂O 

Crystal System

Triclinic 

Crystal Habit

Encrustations, Nodular, Stalactitic 

Cleavage

None, None, None 

Luster

Waxy 

Color

yellow, brown, yellowish green, cinnamon brown, yellowish white 

Streak

yellow 

Class

Triclinic - Pinacoidal 

Fracture

Brittle 

Hardness

3-3.5 

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Mindat

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Soft, light weight, dirty white botryoidal like mass. Overall 5 x 3.5 x 3cm.