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Opal (Var: Opal-AN), Nepheline, Biotite


Opal (Var: Opal-AN) : SiO2·nH2O, Nepheline : (Na,K)[AlSiO4], Biotite

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Locality: Goulding-Keene Quarry (and CN Dump), Dungannon Township, Bancroft District, Hastings Co., Ontario, Canada
Here is the sample under normal light. The piece is 9.1 x 7.8 x 2.2 cm.

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