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Prehnite Julgoldite-(Fe2+) & Calcite

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CLB522904

Prehnite Julgoldite-(Fe2+) & Calcite

Classic Locality

Description Tabs

Description
Locality: 
Rauschermühle Quarry, Niederkirchen, Kaiserslautern, Rhineland-Palatinate, Germany
Class: 
Combination
Size Range: 
Cabinet (10-18 cm)
Size: 
10.7 × 10.4 × 4.5 cm
Description

Big specimen from the famous Rauschermühle quarry. Most of the prehnite crystal aggregates are glossy and show well-defined crystal surfaces. Dark green-black staines are julgoldite. Some calcite crystals on the sides. The quarry is long closed. Good, rich specimen like this here reappear very rarely from old collections.

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

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

Calcite

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

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