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Brandtite Sailaufite & Tilasite

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CLB35039

Brandtite Sailaufite & Tilasite

Type Locality

Description Tabs

Description
Locality: 
Fuchs Quarry, Hartkoppe, Sailauf, Lower Franconia, Bavaria, Germany
Size Range: 
Small cabinet (7-10 cm)
Size: 
2.7 × 7 × 6.7 cm
Largest Crystal: 
0.60cm
Description

OK, you say it's ugly ... but it is rare! Where else do you get dark brown matrix with white rare brandtite needles up to 0.6 cm and a super-rare mineral from it's type locality and a third one which is also rare, which I personally identified as tilasite (I may be wrong, but the other two were identified by someone who knows better than me and you have a very good chance of getting three for the price if two!).

Mineral Data
What's on the rock

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

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

Tilasite

Formula: 
CaMg(AsO4)F
Strunz: 
8.BH.10
Hardness: 
5.0
Type Locality: 
Långban, Filipstad, Värmland, Sweden

Seller Information

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