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Mineralpedia Details for Diadochite

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Diadochite

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)·6H2
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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Diadochite var. Destinezite from Argenteau, Liège Province, Belgium

Diadochite var. Destinezite
            from Argenteau, Liège Province, Belgium

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

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