Graulichite-(Ce)
Graulichite-(Ce) is an IMA-recognized mineral species in the arsenate class, with the chemical formula CeFe³⁺₃(AsO₄)₂(OH)₆.
It crystallizes in the hexagonal crystal system (space group R-3m). It is a member of the Alunite-crandallite structural group.
Key properties: specific gravity 3.9; Resinous luster; optically uniaxial.
IMA symbol Grl-Ce, IMA status: approved, named in 2002.
A secondary mineral formed by weathering of arsenopyrite-bearing metaquartzite.
It is found associated with Scorodite, mimetite, goethite, pharmacosiderite, barium-pharmacosiderite.
The mineral was named to honor mining engineer Jean-Marie Graulich (1920-2001), honorary Director of the Geological survey of 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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