Quartz (Var: Chalcedony), Opal
Specimen ID: HC9-QJ2
Opal : SiO2·nH2O
Mindat locality:
7.5cm x 5.5cm x 3cm
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Photo added to mindat.org
“Piece of opal in brown and cream colors, hosting a vug lined with botryoidal aggregates of chalcedony. Old specimen. ”
Dr. Marcus Lueg - 13th August 2016
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