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Jahnsite-(CaMnMg) & Bermanite

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CR172703

Jahnsite-(CaMnMg) & Bermanite

Rare Mineral

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.5 × 5.5 × 3.8 cm
Description

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

Pale brown to brown, tabular jahnsite-CaMnMg very rich in several vugs with deep red, tabular bermanite crystals all over the specimen.

There are also black rockbridgeite crystals and minor yellow Ushkovite crystals.

Beautiful and very rare !

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

Bermanite

Formula: 
Mn2+Mn3+2(PO4)2(OH)2·4H2O
Strunz: 
8.DC.20
Crystal System: 
Monoclinic
Hardness: 
3.5
Type Locality: 
7U7 Ranch (7-U-7 Ranch), Bagdad Mine area, Hillside, Eureka District, Yavapai Co., Arizona, USA