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Wavellite & Senegalite

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RHT780485

Wavellite & Senegalite

ex collection Hu Hühne, self collected 2007
Type Locality

Description Tabs

Description
Locality: 
Mount Kourou Diakouma, Saraya, Kedougou, Senegal
Class: 
Combination
Size Range: 
Cabinet (10-18 cm)
Size: 
10 × 9.7 × 9 cm
Weight: 
642.00gr
Description

A huge specimen with hundreds, if not thousands of colorless, lath-shaped wavellite crystals, most coated with iron oxides on an iron-ore matrix, mixed with turquoise. A little senegalite vug on the side.

With good magnification you can see there are other colorless (or very pale) crystals growing on top of most of the wavellite crystals - surely pale senegalite or augelite.

Wavellite was very rare at this locality. I was there several times since 2007 and only found about half a dozen specimens. This one is a part of a pretty huge block/vein, and I'm pretty sure you won't find a bigger and richer one from Senegal ever again (I know I said this last time, but I didn't realize then that this one was even a bit heavier. But now I can guarantee that there is no other specimen left that can compare in size and richness.). The whole locality is empty since 2011 or 12, no secondary minerals (senegalite etc.) can be found anymore.

Cleansing might be difficult, because the phosphate is a bit sensitive. That's why we left the iron-oxides on. Might be sensational looking if you find out how to get it off without damaging the wavellite.

Not to mention that free-standing wavellite crystals are quite rare.

Mineral Data
What's on the rock

Wavellite

Formula: 
Al3(PO4)2(OH,F)3·5H2O
Strunz: 
8.DC.50
Hardness: 
3.5 - 4.0
Streak: 
White.
Type Locality: 
High Down Quarry, Filleigh, North Devon, Devon, England, UK

Senegalite

Formula: 
Al2(PO4)(OH)(OH)2·H2O
Strunz: 
8.DE.05
Hardness: 
5.5
Type Locality: 
Mount Kourou Diakouma (Kouroudiako), Saraya, Falémé River basin, Tambacounda Region, Senegal

Seller Information

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