Origin: Rio Grande do Sul, Brazil
Sample size: 23 x 12 x 3.5 cm
Origin: Near Moscow, Moscow Oblast, Russia
Ex. Martin Zinn collection
Sample size: 7.1 x 2.6 x 1.7 cm
Chalcedony coating on chrysocolla
Origin: Globe , Gila Co., Arizona, U.S.A.
Sample size: 5.7 x 4.2 x 2.4 cm
Chalcedony pseudomorph after calcite on chalcedony
Origin: Jalgaon, Maharashtra Province, India
Sample size: 13.6 x 8.7 x 7.0 cm
Chalcedony pseudomorph after fluorite
Origin: Blinkpan, southern Namibia
Ex. Charlie Key collection
Sample size: 18.3 x 10.2 x 3.4 cm (top), 7.3 x 3.9 x 3.0 cm (bottom)

Photo courtesy of: 

Rob Lavinsky

The Arkenstone


Chalcedony on quartz
Origin: Rio Grande do Sul, South Region, Brazil
Sample size: 9.5 x 4.6 x 16 cm

Photo courtesy of: 

Dan Weinrich

Dealer in fine mineral specimens


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Rock crystal     Smoky quartz     Citrine     Amethyst     Rose quartz     Milky quartz     Included quartz     Other quartz types     Agate     Jasper


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