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Analcime

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QRI880613

Analcime

With Antique Label

Description Tabs

Description
Locality: 
Chetaibi, Wilaya de Skikda, Annaba Province, Algeria
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.6 × 2.9 × 2.5 cm
Largest Crystal: 
2.90cm
Weight: 
37.00gr
Description

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

In this very specimen, a large idiomorphic water clear analcime crystal stands on thin grey-green matrix. A second, minor analcime crystal is perched into the main one, intimately interlocked. Associated, some white-yellowish spatic calcite.

Lustre is quite good, with local transparency on the outer rims of the crystal, to the point of being hard to depic. Locally, analcime faces are lightly stained by yellow iron oxides. 
On the back of the specimen, the original archive label. 

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.

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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