Exposition "Mineralforming processes"
Agate of effusive acidic rock
(rhyolite and rhyodacite)
Agate
Kazakhstan
Agate
Chita region, Russia
Agate
Kazakhstan
Agate
Yakutia
Agate
Primorskiy krai, Russia
Agate
Primorskiy krai, Russia
Fersman Mineralogical Museum. Russian Academy of Sciences
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