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Analcime

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QRI750482

Analcime

Gem Crystal

Description Tabs

Description
Locality: 
Chetaibi, Wilaya de Skikda, Annaba Province, Algeria
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 3.6 × 3.9 cm
Largest Crystal: 
1.70cm
Weight: 
84.00gr
Description

Recently I have come across this very interesting lot of analcime from the locality of Chetaibi, Algeria.
Analcime consists of sizeable, water clear crystals of good size, nicely perched on solid matrix, often associated to white-yellowish spatic calcite. In this very specimen, two main crystals stand out of a bed of various millimetric analcime crystals. Lustre is outstanding and transparency is often tip-to-tip deep. A few minor iron oxide stains can be seen throughout the specimen.
I have never seen those specimens on the market, 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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