Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)
Chalcedony (SiO₂)
Category
Browse sedimentary rock (possibly conglomerate or breccia with a quartz vein) specimens identified by the Rock Identifier community.
Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)
Chalcedony (SiO₂)
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Petrified Wood
Silicified Wood (SiO2)
Sandstone Concretion
Sedimentary concretion
Sandstone with Iron Staining
Arenite with Limonite/Hematite inclusions (SiO2 + Fe2O3/FeO(OH))
Sandstone
Sandstone (SiO2 rich)
Quartz Pebble
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Quartz (Pink / Ferruginous)
Silicon Dioxide (SiO2)
Rutilated Quartz
Quartz with Rutile Inclusions (SiO2 with TiO2 inclusions)
Clear Quartz
Silicon Dioxide (SiO2)
Sandstone (lithic wake or graywacke)
Clastic sedimentary rock (primarily quartz and lithic fragments)
Quartz pebble
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Green Chert
Microcrystalline Quartz (SiO2)
Black Onyx
Chalcedony (SiO2)
Chalcedony (Carnelian/Agate)
Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Jasper
Microcrystalline quartz (SiO2)
Green Jasper
Microcrystalline Quartz (SiO2)
Sandstone
Sandstone (Arenite)
Tumbled White Quartz
Silicon Dioxide (SiO2)
Sandstone
Clastic Sedimentary Rock
Sandstone
Clastic Sedimentary Rock
Sandstone
Clastic Sedimentary Rock
River Stone (Sandstone or Siltstone)
Sedimentary Rock (Clastic)
Quartz Pebble (Milky / Clear Quartz)
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Jasper
Silicon dioxide (SiO2)
Leopard Skin Jasper
Silicon Dioxide (SiO2) with various inclusions
Sandstone
Sandstone (composed predominantly of Quartz, SiO2)
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
Sandstone
Clastic Sedimentary Rock
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon dioxide (SiO2)
Banded Agate
Cryptocrystalline Quartz (SiO2)
Cannonball Concretion
Calcite-cemented Sandstone Concretion
Geode
Silicon Dioxide (Quartz/Chalcedony) in carbonate or volcanic host rock
Agate Geode
Silicon Dioxide (Chalcedony/Quartz), SiO2
Agate
Silicon dioxide (Chalcedony), SiO2