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Dawsonite & Dolomite

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MNR717733

Dawsonite & Dolomite

Classic Locality

Description Tabs

Description
Locality: 
Kladno District, Central Bohemian Region, Czech Republic
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 2.5 × 2 cm
Description

Unique sample with white radial aggregate of dawsonite and brownish sphaerical crystals of dolomite. Showy piece, much better in person.

 

Mineral Data
What's on the rock

Dawsonite

Formula: 
NaAlCO3(OH)2
Strunz: 
5.BB.10
Crystal System: 
Orthorhombic
Hardness: 
3.0
Streak: 
White
Type Locality: 
McGill University campus, Montréal, Québec, Canada

Dolomite

Formula: 
CaMg(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
3.5 - 4.0
Streak: 
White