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Analcime

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QRI1102984

Analcime

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Description
Locality: 
Chetaibi, Wilaya de Skikda, Annaba Province, Algeria
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.7 × 3.7 × 3.3 cm
Largest Crystal: 
0.70cm
Weight: 
50.00gr
Description

In 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 on solid matrix, often associated to white-yellowish spatic calcite.

In this very drusy, approx a dozen of fully transparent and lustrous analcime crystals partially epimorph some blocky, cream colored calcite crystals.

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.

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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