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Stilbite

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MGR761480

Stilbite

Classic Locality

Description Tabs

Description
Locality: 
Das Antas Tunnel, Veranópolis, Rio Grande do Sul, Brazil
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
9.8 × 8 × 4.5 cm
Description

If this was only from India it would have a common status. But this piece is from a unique famous discovery during the construction of the Das Antas Tunnel - this stuff came only one time; it is unique! And the specimen is not just a smaple - most specimen developed only tiny crystals, the size and the assemble are out-standing; among teh very best from the locality. Should be high valued for this rare locality! The faces are lustrous, the color is something between brown and orange. The assemble is very tri-dimensional and eye-catching. No significant damages to report.

Mineral Data
What's on the rock

Stilbite

Synonym Of: 

Stilbite-Ca

Formula: 
NaCa4[Al9Si27O72]·nH2O
Strunz: 
9.GE.10
Hardness: 
3.5 - 4.0

Stilbite-Na

Formula: 
(Na,Ca,K)6-7[Al8Si28O72]·nH2O
Strunz: 
9.GE.10
Hardness: 
3.5 - 4.0
Hardness: 
3.5 - 4
Colour: 
White
Streak: 
White