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Richellite & Delvauxite

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RSL612728

Richellite & Delvauxite

Type Locality

Description Tabs

Description
Locality: 
Richelle, Visé, Liège Province, Belgium
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.8 × 3.7 × 3.5 cm
Description

Richellite is a very rare calcium and iron phosphate. The mineral is the red-brown coating on the matrix, this waxy layer. It occurs as a secondary (?) mineral in phosphatic sedimentary rocks, usually associated to other phosphates like delvauxite (darker brown) or koninckite. It is probably a former gel with variable chemical composition. This rich specimen is from the Type Locality in Belgium. SEM-EDS analysis only shows the P, Ca and Fe presence, mixed with Si. Good size.

Mineral Data
What's on the rock

Delvauxite

Formula: 
CaFe4(PO4,SO4)2(OH)8·4-6H2O not confirmed·
Strunz: 
8.DM.35
Crystal System: 
Amorphous
Hardness: 
2.5
Streak: 
Yellow
Type Locality: 
Château de Berneau, Berneau, Dalhem, Liège, Liège Province, Belgium
Analysis
Analysis Report - only: Richellite & Delvauxite
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