Hydrated phosphate containing hydroxyl and halogen
Specific gravity: 2
Hardness: 2 to 3
Streak: Reddish to yellowish brown
Colour: Yellow to yellow-brown, reddish brown
Solubility: Readily soluble in acids
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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