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Jahnsite-(NaMnMg) & Cacoxenite

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SER703178

Jahnsite-(NaMnMg) & Cacoxenite

Type Locality

Description Tabs

Description
Locality: 
Sapucaia do Norte, Galiléia, Minas Gerais, Brazil
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.1 × 2.1 × 1.7 cm
Description

a cluster of dark brown frondelite crystals hosts several yellow new  jahnsite-(NaMnMg) crystals with yellow tufts of cacoxenite; I found this new jahnsite some years ago in the Sapucaia's dumps and was analysed by Antony Kampf

Mineral Data
What's on the rock

Jahnsite-(NaMnMg)

Formula: 
{(Na,Ca)}{(Mn2+,Fe3+)}{(Mg,Fe3+)2}{Fe3+2}(PO4)4(OH)2 · 8H2O
Strunz: 
8.DH.15
Crystal System: 
Monoclinic
Type Locality: 
Sapucaia Mine, Sapucaia do Norte, Galiléia, Minas Gerais, Brazil

Cacoxenite

Formula: 
Fe3+24Al(PO4)17O6(OH)12·17H2O
Strunz: 
8.DC.40
Hardness: 
3.0 - 4.0
Type Locality: 
Hrbek Mine, Svatá Dobrotivá (St Benigna), Beroun (Beraun), Central Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic
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