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Sailaufite & Brandtite

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JYJ189602

Sailaufite & Brandtite

Description Tabs

Description
Locality: 
Sailauf, Lower Franconia, Bavaria, Germany
Size Range: 
Thumbnail (1-3cm)
Size: 
2.2 × 1.6 × 1.4 cm
Description

Black to brown sailaufite aggregates intergrown with brandtite or on calcite. Interestingly the bottom side shows quartz quartz, which occured not often in this paragenesis.

Mineral Data
What's on the rock

Sailaufite

Formula: 
(Ca,Na,☐)2Mn3+3(AsO4)2(CO3)O2·3H2O
Strunz: 
8.DH.30
Hardness: 
4.0 - 0.0
Streak: 
Brown
Type Locality: 
Fuchs Quarry, Hartkoppe, Sailauf, Hösbach, Spessart, Franconia, Bavaria, Germany

Brandtite

Formula: 
Ca2(Mn2+,Mg)(AsO4)2·2H2O
Strunz: 
8.CG.10
Crystal System: 
Monoclinic
Hardness: 
3.5
Type Locality: 
Harstigen Mine, Pajsberg, Persberg district, Filipstad, Värmland, Sweden