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Arfvedsonite & Aegirine On Analcime

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PJM87059

Arfvedsonite & Aegirine On Analcime

Ex J & S Mommers Collection.

Description Tabs

Description
Locality: 
Mont Saint-Hilaire, Montérégie, Québec, Canada
Size Range: 
Thumbnail (1-3cm)
Size: 
2.6 × 2.4 × 1.8 cm
Description

Beautifully balanced atop a 1.1 cm white analcime crystal are a deepgreen to black twiined doubly terminated arfvedsonite crystal and a singe slender black aegerine crystal, from the famous alkaline sills at Mount Saint Hilaire.

Mineral Data
What's on the rock

Arfvedsonite

Formula: 
[Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
Strunz: 
9.DE.25
Hardness: 
5.0 - 6.0
Type Locality: 
Kangerluarsuk Fjord (Kangerdluarssuq Fjord), Ilímaussaq complex, Narsaq, Kujalleq, Greenland

Aegirine

Formula: 
NaFe3+Si2O6
Group Parent: 
Clinopyroxene Subgroup
Strunz: 
9.DA.25
Crystal System: 
Monoclinic
Hardness: 
6.0
Type Locality: 
Rundemyr, Øvre Eiker, Buskerud, Norway

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
Earthstones Australia

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