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Gonnardite Calcite & Chabazite Var Phacolite On Ilmenite & Analcime

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PMN853358

Gonnardite Calcite & Chabazite Var Phacolite On Ilmenite & Analcime

Description Tabs

Description
Locality: 
Bundoora, City of Whittlesea, Victoria, Australia
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
6 × 11 × 3.5 cm
Largest Crystal: 
2.00cm
Description

Calcite (ferroan) with white gonnardite and clear chabazite-Na (phacolite) sit on a sparkling matrix covered with tiny (1-2 mm) crystal assemblies of ilmenite, calcite and very clear and prefect analcime on very hard basalt.It's like two specimen in one, one nice display specimen for the larger minerals and a very rich and good specimen for under the microscope.

Collected in 1999 by Dr. D.Vince. It's a very clean and bright specimen with rich coverage of these not so common zeolites and interesting habit of calcite.

The location has been reclaimed and is now a parkland in a melbourne suburb.

Note buyers are responsible for local taxes and fees.We are happy to combine shipping - you only pay the stated shipping fee for the first specimen, subsequent pieces are included free of shipping costs.

Mineral Data
What's on the rock

Gonnardite

Formula: 
(Na,Ca)2(Si,Al)5O10·3H2O
Strunz: 
9.GA.05
Hardness: 
4.0 - 5.0
Type Locality: 
La Chaux de Bergonne, Gignat, Saint-Germain-Lembron, Puy-de-Dôme, Auvergne, France

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

Chabazite

Synonym Of: 

Chabazite-Ca

Formula: 
(Ca,K2,Na2)2[Al2Si4O12]2·12H2O
Strunz: 
9.GD.10
Hardness: 
4.0 - 5.0

Chabazite-K

Formula: 
(K2,Ca,Na2,Sr,Mg)2[Al2Si4O12]2·12H2O
Strunz: 
9.GD.10
Hardness: 
4.0

Chabazite-Mg

Formula: 
(Mg0.7K0.5Ca0.5Na0.1)[Al3Si9O24]·10H2O
Strunz: 
9.GD.10
Hardness: 
4.0 - 0.0

Chabazite-Na

Formula: 
(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2·12H2O
Strunz: 
9.GD.10
Hardness: 
4.0

Chabazite-Sr

Formula: 
Sr2[Al2Si4O12]2·12H2O
Strunz: 
9.GD.10
Hardness: 
4.0 - 4.5

Ilmenite

Formula: 
Fe2+TiO3
Strunz: 
4.CB.05
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
5.0 - 6.0
Type Locality: 
Ilmen Natural Reserve, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia...

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