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Jahnsite-(CaMnMg) & Hureaulite

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CR844357

Jahnsite-(CaMnMg) & Hureaulite

Rare Mineral

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.6 × 2 × 1.5 cm
Description

This is a fantastic small specimen of several very rare phosphate species which are all very well crystallized.

Pale brown to brown, tabular jahnsite-CaMnMg very rich on and with pale pink hureaulite.

There are also black rockbridgeite crystals.

Beautiful and very rare !

EDS confirmed specimen !

Mineral Data
What's on the rock

Jahnsite-(CaMnMg)

Formula: 
{Ca}{Mn2+}{(Mg,Fe2+)2}{Fe3+2}(PO4)4(OH)2·8H2O
Strunz: 
8.DH.15
Hardness: 
4.0
Streak: 
White
Type Locality: 
Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA

Hureaulite

Formula: 
(Mn,Fe)5(PO4)2(HPO4)2·4H2O
Strunz: 
8.CB.10
Hardness: 
5.0
Type Locality: 
Les Hureaux, Saint-Sylvestre, Haute-Vienne, Limousin, France