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Dawsonite & Calcite

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TBM1142040

Description Tabs

Description
Locality: 
Piancastagnaio, Siena Province, Tuscany, Italy
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
4 × 7 × 5.5 cm
Largest Crystal: 
0.40cm
Weight: 
142.00gr
Description

Nice white tufts of acicular Dawsonite crystals collected in sheaf of 4 mm of diameter with Calcite crystals up to 10 mm

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

Calcite

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