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Scolecite Fluorapophyllite-(K) & Stilbite

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CLB169407

Scolecite Fluorapophyllite-(K) & Stilbite

Classic Locality

Description Tabs

Description
Locality: 
Das Antas Tunnel, Rio Grande do Sul, Brazil
Size Range: 
Cabinet (10-18 cm)
Size: 
13 × 10.3 × 9.3 cm
Description

This is not the ordinary bulk material from India, but a - today very rare - beautiful, large scolecite- /apophyllite-specimen from the famous Das-Antas-tunnel zeolite find from the early sixties. The occurence was found during the built of railway tunnels by the Federal Railways (Rede Ferroviária Federal SA - RFFSA), connecting São Paulo with the city of Rio Grande.
The colorless, acicular scolecite crystals measure up to 5 cm, the greenish fluorapophylolite-(k) up to 3.5 cm. The minor orange mineral might be iron-oxides-colored stilbite or heulandite.
A few dings, but still beautiful and better in nature.
Weights about 1.5 kg

Mineral Data
What's on the rock

Scolecite

Formula: 
CaAl2Si3O10·3H2O
Strunz: 
9.GA.05
Hardness: 
5.0 - 5.5
Streak: 
white

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

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