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Oneillite

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CHA505201

Oneillite

Rare Mineral

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Description
Locality: 
Água de Pau Volcano, São Miguel Island, Azores District, Portugal
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
1.8 × 1.3 × 1 cm
Description

Caramel colour crystals of oneillite.
Second occorrence of this extremely rare mineral from the "agua de pau" . in this locality I have found only few crystals of oneillite : the only known crystals on matrix of this specie

Mineral Data
What's on the rock

Oneillite

Formula: 
Na15Ca3Mn3Fe2+3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2
Strunz: 
9.CO.10
Crystal System: 
Trigonal
Hardness: 
5.0 - 6.0
Type Locality: 
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

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Start 06 Oct 18:00
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