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Analcime

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QRI942806

Analcime

With Antique Label

Description Tabs

Description
Locality: 
Chetaibi, Wilaya de Skikda, Annaba Province, Algeria
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.8 × 4.8 × 1.6 cm
Largest Crystal: 
2.50cm
Weight: 
61.00gr
Description

Late 2019 I have come across this very interesting small lot of analcime from the locality of Chetaibi, Algeria.

Analcime consists of sizeable, water clear crystals of good size, nicely perched in a vein of solid matrix, often associated to white-yellowish spatic calcite. In this very specimen, a major analcime crystal (amost 1 inch across!) occupies a large part of a vein. Lustre is outstanding and transparency is remarkable on the outer rims of the crystal, to the point of being hard to depic.

I have never seen those specimens on the market before, and I think they do set a high standard among African analcime. From a small find from a Swiss engineer in the 60s (possibly from a roadcut?), only a few specimens were recovered.

This is one of the best of the entire lot.

Pasted Label
Mineral Data
What's on the rock

Analcime

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

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