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Prehnite Psm Laumontite

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PDM805056

Prehnite Psm Laumontite

Pseudomorph

Description Tabs

Description
Locality: 
Malad Quarry, Mumbai, Maharashtra, India
Class: 
Crystal Group/Cluster
Size Range: 
Museum (18cm plus)
Size: 
18 × 15 × 8.3 cm
Description

Museum size example of granular aggregated pale green prehnite crystals that form elongated, tube-like structures because they grew as perimorphs after now dissolved laumontite crystals. Typical old specimen from the Malad Quarry.

Acquired in 1980. Ex Herman Torfs collection.

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

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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