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Apophyllite & Stilbite

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WND867362

Apophyllite & Stilbite

Classic Locality

Description Tabs

Description
Locality: 
Das Antas Tunnel, Veranópolis, Rio Grande do Sul, Brazil
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.9 × 6.4 × 6.6 cm
Description

A very showy and excellent small cabinet piece of glassy, colourless and translucent, cubed and cuboid, blocky Apophyllite crystals accompanied by a cluster of bladed light yellow-brown Stilbite. This specimen comes from a one-time find during the construction of the Das Antas Tunnel of Rio Grande do Sul, Brazil. Apophyllite and Stilbite from Barzil are relatively uncommon and this is a real good specimen.

Mineral Data
What's on the rock

Apophyllite

Synonym Of: 

Fluorapophyllite-(K)

Formula: 
KCa4(Si8O20)(F,OH)·8H2O
Strunz: 
9.EA.15
Hardness: 
4.5 - 5.0

Fluorapophyllite-(Na)

Formula: 
NaCa4(Si8O20)F·8H2O
Strunz: 
9.EA.15
Hardness: 
4.0 - 5.0

Hydroxyapophyllite-(K)

Formula: 
KCa4(Si8O20)(OH,F)·8H2O
Strunz: 
9.EA.15
Hardness: 
4.0 - 5.0

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
Wendel Minerals

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