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Calcite & Ulexite

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SKI660563

Calcite & Ulexite

Description Tabs

Description
Locality: 
U S Borax Mine, Boron, Kern County, California, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 2 × 2.1 cm
Largest Crystal: 
1.20cm
Description

Brownish-yellow tabular Calcites intergrown with fibrous white Ulexite. Those are said to be pseudomorphs but it is not determinable for me if the Calcite is replacing the Ulexite or only intergrown with it. Anyway an interesting example from California.

Mineral Data
What's on the rock

Calcite

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

Ulexite

Formula: 
NaCa[B5O6(OH)6]·5H2O
Strunz: 
6.EA.25
Crystal System: 
Triclinic
Hardness: 
2.5
Type Locality: 
Iquique Province, Tarapacá Region, Chile

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