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Mineralpedia Details for Oneillite

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Oneillite

Oneillite

Named for John Johnston O’Neill, as a geologist with the Geological Survey of Canada and Professor of Geology and Dean of Science and Dean of Engineering at McGill University in Montreal, Canada. The type and only locality for Oneillite is at the Poudrette quarry at Mont Saint-Hilaire in Quebec, Canada where it is found at a contact between a vein of albite and the nepheline syenite. Oneillite occurs as yellow to brown anhedral grains.

Ref. Minerals and their Localities, Bernard, J.H. and Hyršl, J. (2004)

IMA/CNMNC List of Mineral Names (2009) and Canadian Mineralogist 37 (1999), 1295

Formula
Na15Ca3Mn3Fe3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 
Crystal System
Trigonal 
Crystal Habit
Anhedral Grains 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
yellowish brown 
Streak
white 
Class
Trigonal - Pyramidal 
Fracture
Brittle - Uneven 
Hardness
5-6 
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Oneillite from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada

Oneillite
            from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada

Golden brown anhedral crystals to 1mm.

Click thumbnail images for larger view.

Oneillite from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada

Oneillite
            from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada
Special Info
Type & Only Locality

Brownish orange crystal grains encompassing an area to 5mm across.

Click thumbnail images for larger view.

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