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MGR703108

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Description
Locality: 
Rio Fromm, Castelrotto, Siusi Alp, South Tirol, Trentino-Alto Adige, Italy
Class: 
Single Crystal
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.8 × 4.1 × 3.6 cm
Description

The crystal shows sharp termination and glossy faces. And there is a very uncoomon detail - there is squre-formed hole inside the crystal as you can see on the second image in the gallery. Only a small area backside was extracted from the rock! The dimension of the crystal is very good for the locality. No significant damages to report.

Mineral Data
What's on the rock

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Formula: 
Na2(Al2Si4O12)·2H2O
Strunz: 
9.GB.05
Crystal System: 
Triclinic
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Cyclopean Islands, Acitrezza (Aci Trezza), Etna Volcanic Complex, Catania Province, Sicily, Italy