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Prehnite With Julgoldite

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CLB41384

Prehnite With Julgoldite

Classic Locality

Description Tabs

Description
Locality: 
Rauschermühle Quarry, Niederkirchen, Kaiserslautern, Rhineland-Palatinate, Germany
Size Range: 
Cabinet (10-18 cm)
Size: 
5.5 × 13 × 9 cm
Description

A very nice and interesting specimen of blue-green prehnite, partly covered by julgoldite and a strange pseudomorph, that looks like calcite crystals which have been covered by millions of microscopic quartz crystals and afterwards were etched away.

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

Synonym Of: 

Julgoldite-(Fe2+)

Formula: 
Ca2(Fe2+,Mg)(Fe3+,Al)2(Si2O7)(SiO4)(OH)2·H2O
Strunz: 
9.BG.20
Hardness: 
0.0

Julgoldite-(Fe3+)

Formula: 
Ca2(Fe3+,Mg)(Fe3+,Al)2(Si2O7)(SiO4)(OH,O)2·H2O
Strunz: 
9.BG.20
Hardness: 
4.5

Julgoldite-(Mg)

Formula: 
Ca2(Mg,Fe2+)(Fe3+,Al)2(Si2O7)(SiO4)(OH)2·H2O
Strunz: 
9.BG.20
Hardness: 
0.0
Group Parent: 
Pumpellyite Group

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