A cross-section of agate. Multicolored silica rings colored with metal oxides are visible. Micro-stalactite agate (in reverse position). Origin: Rudno near Krakow, Poland. Stickers #238441840
A cross-section of agate. Multicolored silica rings colored with metal oxides are visible. Micro-stalactite agate (in reverse position). Origin: Rudno near Krakow, Poland. Poster #238441840