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Laumontite

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LAM772486

Laumontite

Classic Locality

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Description
Locality: 
La Cabrera, Madrid, Spain
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
6 × 3 × 3 cm
Description

Aggregate of white laumontite crystals with minor apophyllite-(KF). Laumontite dehydrates easily when stored in a low humidity environment, so this specimen has been protected with a coat of lacquer to prevent it

Mineral Data
What's on the rock

Laumontite

Formula: 
CaAl2Si4O12·4H2O
Strunz: 
9.GB.10
Hardness: 
3.5 - 4.0
Streak: 
White
Type Locality: 
Huelgoat (Locmaria-Berrien), Finistère, Brittany, France

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