Agate SiO2 I, Lake Superior, Marquette, Michigan
Agate SiO2 II, Lake Superior, Marquette, Michigan
Agate SiO2 II, Lake Superior, Marquette, Michigan
Condor Agate SiO2 San Rafael, Mendoza Province, Argentina
Condor Agate SiO2 San Rafael, Mendoza Province, Argentina
Agatized Fossil Coral SiO2 Miocene (25-32 million years), Gulf Coast of Florida
Agate SiO2 Brazil
Agate SiO2 IV, Lake Superior, Marquette, Michigan
Agate SiO2 V, Lake Superior, Marquette, Michigan
Agate SiO2 VI, Lake Superior, Marquette, Michigan
Agate SiO2
"Bacon" Agate SiO2 Lake Superior, Marquette Co., Michigan
Agate SiO2 VII, Lake Superior, Marquette Co., Michigan
Agate SiO2 VII, Lake Superior, Marquette Co., Michigan
Agate SiO2 Agatized Coral, Florida
Agate SiO2 Agatized Coral, Under SW UV Light, Florida
Agate SiO2 Agatized Coral, Florida
Agate SiO2 Agatized Coral, Under SW UV Light, Florida