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Oneillite

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CHA534493

Oneillite

Rare Mineral

Description Tabs

Description
Locality: 
Água de Pau Volcano, São Miguel Island, Azores District, Portugal
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.3 × 2.5 × 2 cm
Description

one of the best specimen of this mineral: "Agua de Pau" is the only locality where the oneillite is in idiomorphic crystals.

On this specimen there are some very nice brown crystals: fantastic!

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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