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Prehnite Calcite & Julgoldite-(Fe2+)

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MEX801959

Prehnite Calcite & Julgoldite-(Fe2+)

Classic Locality

Description Tabs

Description
Locality: 
Kreimbach-Kaulbach Quarry, Lauterecken-Wolfstein, Kusel, Rhineland-Palatinate, Germany
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.7 × 5.6 × 4.2 cm
Weight: 
206.00gr
Description

Well terminated prehnite specimen with few calcite crystals together on the matrix.

Mineral Data
What's on the rock

Prehnite

Formula: 
Ca2Al2Si3O10(OH)2
Strunz: 
9.DP.20
Hardness: 
6.0 - 6.5
Streak: 
White
Type Locality: 
Karoo dolerites, Cradock, Chris Hani District, Eastern Cape Province, South Africa

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

Julgoldite-(Fe2+)

Formula: 
Ca2(Fe2+,Mg)(Fe3+,Al)2(Si2O7)(SiO4)(OH)2·H2O
Strunz: 
9.BG.20
Crystal System: 
Monoclinic
Hardness: 
0.0
Type Locality: 
Långban, Filipstad, Värmland, Sweden