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Formula: CaFe3+2(PO4)2(OH,F)2
Hydrated phosphate containing hydroxyl and halogen
Crystal System: Amorphous
Specific gravity: 2
Hardness: 2 to 3
Streak: Reddish to yellowish brown
Colour: Yellow to yellow-brown, reddish brown
Solubility: Readily soluble in acids
Environments
Localities
At the type locality, Richelle, Visé, Liège, Wallonia, Belgium, richellite occurs in phosphatic sedimentary
rocks as creamy yellow masses, associated with halloysite,
allophane and koninckite
(HOM, Mindat).
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