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Jahnsite-(MnMnMg) Gordonite & Frondelite

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Jahnsite-(MnMnMg) Gordonite & Frondelite

Type Locality

Description Tabs

Description
Locality: 
Sapucaia Mine, Sapucaia do Norte, Galiléia, Minas Gerais, Brazil
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2.6 × 1.5 × 0.6 cm
Description

a carpet of dark green frondelite crystals hosts several yellow crystals of the new jahnsite specie, in this case with light yellow gordonite crystals; this new jahnsite was analysed by Pietro Vignola and comes from an only boulder that I found on 2012 in the Sapucaia's dumps

Mineral Data
What's on the rock

Jahnsite-(MnMnMg)

Formula: 
Mn2+Mn2+Mg2Fe3+2(PO4)4(OH)2 · 8H2O
Crystal System: 
Monoclinic
Type Locality: 
Sapucaia do Norte, Galiléia, Minas Gerais, Brazil

Gordonite

Formula: 
MgAl2(PO4)2(OH)2·8H2O
Strunz: 
8.DC.30
Hardness: 
3.5
Streak: 
White
Type Locality: 
Clay Canyon, Fairfield, Oquirrh Mts, Utah Co., Utah, USA

Frondelite

Formula: 
Mn2+Fe3+4(PO4)3(OH)5
Strunz: 
8.BC.10
Hardness: 
4.5
Type Locality: 
Sapucaia Mine (Proberil mine), Sapucaia do Norte, Galiléia, Doce valley, Minas Gerais, Brazil