Agate
Silicon dioxide (Chalcedony), SiO2
Category
Browse sedimentary (silicified fossiliferous chalcedony) specimens identified by the Rock Identifier community.
Agate
Silicon dioxide (Chalcedony), SiO2
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
Agate
Silicon Dioxide (Chalcedony), SiO2
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
Agate
Silicon dioxide (Chalcedony), SiO2
Agate
Silicon dioxide (Chalcedony), SiO2
Agate
Silicon Dioxide (Chalcedony), SiO2
Lake Superior Agate
Silicon dioxide (Chalcedony / Quartz)
Agate
Silicon Dioxide (Chalcedony), SiO2
Agate
Silicon dioxide (Chalcedony), SiO2
Agate
Silicon Dioxide (Chalcedony), SiO2
Agate
Silicon Dioxide (Chalcedony), SiO2
Agate
Silicon dioxide (Chalcedony variety)
Agate
Silicon Dioxide (Chalcedony), SiO2
Agate
Silicon dioxide (Chalcedony), SiO2
Agate
Silicon dioxide (Chalcedony), SiO2
Agate
Silicon Dioxide (Chalcedony), SiO2
Agate
Silicon Dioxide (Chalcedony), SiO2
Lake Superior Agate
Silicon Dioxide (Chalcedony variety)
Agate
Silicon Dioxide (Chalcedony), SiO2
Brecciated Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
Agate
Silicon dioxide (Chalcedony), SiO2
Eye Agate
Chalcedony (Silicon Dioxide, SiO2)
Red Jasper
Chalcedony (SiO2 with Iron inclusions)
Yellow Jasper
Chalcedony (SiO2 with iron impurities)
Yellow Jasper
Chalcedony (Silicon Dioxide, SiO2)
Crazy Lace Agate
Chalcedony (SiO2) with microcrystalline quartz
Geode (unopened)
Chert / Chalcedony Geode (SiO2)
Jasper
Silicon dioxide / Chalcedony (SiO2)
Agate (Lake Superior Agate variant)
Chalcedony / Silicon Dioxide (SiO2)
Zebra Jasper
Tumbled Opaque Chalcedony (SiO2)
Chalcedony (Yellow/Brown Agate Pebble)
Silicon Dioxide (SiO2)
Petrified Wood (Silicified Wood)
Silicified Wood / Silicon Dioxide (SiO2)
Chalcedony (Botryoidal/Agate nodule)
Microcrystalline Quartz (SiO2)
Agate (specifically a small Chalcedony nodule)
Agate (Cryptocrystalline variety of Quartz, SiO2)
Chalcedony (Agate/Carnelian)
Cryptocrystalline Quartz (SiO2)
Polished brecciated jasper
Silicified breccia, chiefly microcrystalline quartz (SiO₂) with iron-oxide staining
Carnelian (Orange Agate)
Carnelian (variety of Chalcedony, SiO2)
Pietersite
Brecciated Crocidolite in Quartz (Chalcedony)
Chert / Flint
Silicon Dioxide (Microcrystalline Quartz, $SiO_2$)
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)