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Laumontite With Calcite

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QRI784737

Laumontite With Calcite

Former collection Christian Mavris
Classic Locality

Description Tabs

Description
Locality: 
Crastu Muradu Quarry, Osilo, Sassari Province, Sardinia, Italy
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.3 × 6.5 × 4.6 cm
Largest Crystal: 
0.50cm
Weight: 
205.00gr
Description

Textbook candid white laumontite crystals populate a centimetric altered volcanic vug. Associated, also several brown scalenohedral calcite crystals, which provide a striking color contrast. 

Good size specimen on solid matrix. A Sardinina classic displaying the colorful local paragenesis. In my collection since the late 90s.

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

Calcite

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

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