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Gismondine-Ca Chabazite-Ca & Analcime

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PAV943179

Gismondine-Ca Chabazite-Ca & Analcime

New Discovery

Description Tabs

Description
Locality: 
Fajã Escura, Curral das Freiras, Câmara de Lobos, Madeira Islands, Portugal
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2.4 × 2.1 × 1.5 cm
Description

Very nice sample!

Several gismondine-Ca crystals associated to water clear twinned chabazite-Ca, complex analcime ({100} modified by {211}) and tinny magnetite.

Collected: 
2022
Boxed with Label
Mineral Data
What's on the rock

Gismondine-Ca

Formula: 
CaAl2Si2O8·4H2O
Strunz: 
9.GC.05
Hardness: 
0.0

Chabazite-Ca

Formula: 
(Ca,K2,Na2)2[Al2Si4O12]2·12H2O
Strunz: 
9.GD.10
Hardness: 
4.0 - 5.0
Streak: 
White
Type Locality: 
Colle del Lares, San Nicolò Valley, Buffaure Group, Fassa Valley, Trento Province, Trentino-Alto Adige, Italy

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