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Preiswerkite & Zoisite

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Preiswerkite & Zoisite

Type Locality

Description Tabs

Description
Locality: 
Geisspfad, Binn, Goms, Valais, Switzerland
Size Range: 
Thumbnail (1-3cm)
Size: 
1.2 × 1 × 1.3 cm
Description

Preiswerkite was found in a basic dyke within the ultramafic body of the Geisspfad. This mica presents greenish white nodular aggregates, with rims of alpha-zoisite.

Found exactly on the described TL in 1995 when we pinpointed this with the original Keusen-literature from 1972

(GP001)

Mineral Data
What's on the rock

Preiswerkite

Formula: 
NaMg2Al(Al2Si2O10)(OH)2
Strunz: 
9.EC.20
Hardness: 
2.5
Type Locality: 
Geisspfad pass, Geisspfad area, Binn Valley, Wallis (Valais), Switzerland

Zoisite

Formula: 
{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Strunz: 
9.BG.10
Hardness: 
6.0 - 7.0
Streak: 
White
Type Locality: 
Prickler Halt, Ladinger Spitze - Speikkogel area, Saualpe, Carinthia, Austria
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