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Prehnite & Opal

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TPX918944

Prehnite & Opal

Classic Locality

Description Tabs

Description
Locality: 
Los Taberneros Quarry, El Berrueco, Madrid, Madrid, Spain
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4 × 3.8 × 2.1 cm
Weight: 
38.00gr
Description

Very nice group of prehnite crystals partially coated with opal which fluoresces under long wave ultraviolet light and turns green. The sample is on an orthoclase 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

Opal

Formula: 
SiO2·nH2O
Strunz: 
4.DA.10
Hardness: 
5.5 - 6.5
Streak: 
White

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