One highly aesthetic, large cabinet size specimen presenting a pseudomorph of chalcedony after steep calcite scalenohedral crystals, lately dissolved and covered by chalcedony. The calcite crystals were developed on long axes prismatic quartz crystals.
Тип минерал: chalcedony
Botroidal blue chalcedony
One very aesthetic miniature specimen of botroidal blue colour chalcedony formed after spherulites of chalcedony on the mother rock.