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Robertsite Jahnsite & Hureaulite

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SER920353

Robertsite Jahnsite & Hureaulite

Description Tabs

Description
Locality: 
Lagoa do Andres, Picuí, Borborema Province, Paraiba, Brazil
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.1 × 2.8 × 2.2 cm
Description

some vugs in pegmatite filled with dark red to black robertsite balls and tiny crystals, oranhe jahnsite group and pink hureaulite crystals ; self collected on 2016

Mineral Data
What's on the rock

Robertsite

Formula: 
Ca3Mn3+4(PO4)3O2·3H2O
Strunz: 
8.DH.30
Hardness: 
3.5
Streak: 
Red-brown
Type Locality: 
Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA

Jahnsite

Synonym Of: 

Jahnsite-(CaMnFe)

Formula: 
{Ca}{Mn2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2·8H2O
Strunz: 
8.DH.15
Hardness: 
4.0

Jahnsite-(CaMnMg)

Formula: 
{Ca}{Mn2+}{(Mg,Fe2+)2}{Fe3+2}(PO4)4(OH)2·8H2O
Strunz: 
8.DH.15
Hardness: 
4.0

Jahnsite-(CaMnMn)

Formula: 
{Ca}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2·8H2O
Strunz: 
8.DH.15
Hardness: 
4.0

Jahnsite-(MnMnMn)

Formula: 
{Mn2+}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2·8H2O
Strunz: 
8.DH.15
Hardness: 
4.0

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