Richellite
Richellite is an IMA-recognized mineral species in the phosphate class, with the chemical formula CaFe³⁺₂(PO₄)₂(OH,F)₂.
Key properties: Mohs hardness 2–3; specific gravity 2; Reddish to yellowish brown streak; Greasy to hornlike, subvitreous luster.
IMA symbol Rhe, IMA status: questionable, named in 1883.
Presumably as a secondary mineral in phosphatic sedimentary rocks.
It is found associated with Halloysite, allophane, koninckite (Richelle, Belgium).
The name is derived from the locality where first found, Richelle, Belgium.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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