Agate Geode
Cryptocrystalline Quartz (SiO2)
mineral
Category
Sedimentary (Silicified Fossiliferous Chalcedony)
Browse sedimentary (silicified fossiliferous chalcedony) specimens identified by the Rock Identifier community.
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Dyed Chalcedony (Agate)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Tumbled blue chalcedony (likely blue quartz/chalcedony)
Cryptocrystalline silica, SiO₂; likely chalcedony, possibly dyed or surface-coated
mineral
Black Onyx
Cryptocrystalline Quartz (SiO2) with impurities
mineral
Blue Lace Agate
Chalcedony (SiO2)
mineral
Red Jasper (possibly)
Jasper (a variety of Chalcedony, SiO2)
Mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Carnelian (Yellow-Orange Chalcedony)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Red Jasper / Carnelian Chalcedony
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
gemstone
Red Jasper
Jasper (Silicon Dioxide) - SiO2
mineral
Honey/brown agate (chalcedony)
Microcrystalline quartz, SiO₂; likely translucent agate or chalcedony
mineral
Quartz Pebble (Chert/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Yellow Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO₂)
mineral
Flint
Silicon dioxide (SiO2) microcrystalline quartz
sedimentary
Flint
SiO2 (Cryptocrystalline Quartz / Chert)
sedimentary
Smoky Quartz and Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Agate (Common Chalcedony)
Silicon Dioxide (SiO2)
mineral
Banded Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Red Jasper (River-worn Pebble)
Silicon Dioxide (SiO2) with Ferric Iron inclusions
sedimentary (microcrystalline silicate)
Botryoidal Chalcedony / Quartz
Silicon Dioxide (SiO2)
mineral
Druzy Agate Geode
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Tumbled jasper or chert
Microcrystalline quartz (SiO₂), possibly iron-bearing jasper
mineral
Polished carnelian/chalcedony pebble
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony
gemstone
Jasper (Iron-stained Chalcedony)
SiO2 with Fe2O3 (Iron Oxide) impurities
Sedimentary / Mineral (Silica)
Tumbled jasper or iron-rich chalcedony
Microcrystalline quartz (SiO₂), likely colored by iron oxides
mineral
Carnelian Agate
Silicon dioxide (SiO2) - variety of Chalcedony
mineral
Carnelian Agate
Silicon Dioxide (SiO₂), a variety of Chalcedony
mineral
Petrified Wood
Silicon Dioxide Fossilized Wood (SiO2)
fossil
Flint/Chert Nodule in Limestone
Sedimentary rock containing microcrystalline quartz (SiO2) within a calcium carbonate (CaCO3) matrix
sedimentary
Tumbled agate or chalcedony
Microcrystalline quartz (SiO₂), likely brown/orange chalcedony or agate
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide impurities
sedimentary (chemical)
Tumbled chert or flint pebble
Microcrystalline quartz (SiO₂), commonly with chalcedony and minor iron oxides
sedimentary
Geode (Unopened)
Chalcedony Geode (Hydrated Silicon Dioxide, SiO2)
sedimentary
Carnelian
Carnelian (a variety of Chalcedony), SiO2 (Silicon Dioxide)
mineral
Yellow Agate
Agate (Varietal form of Chalcedony/Quartz, SiO2)
mineral
Likely weathered chert or flint
Microcrystalline quartz (SiO₂), probably chalcedony/chert
sedimentary
Red Jasper (or Ironstone Pebble)
SiO2 (Quartz/Microcrystalline Chalcedony with Hematite inclusions)
sedimentary
Thunder Egg (Agate/Jasper filled)
Chalcedony variety Agate/Jasper in a Rhyolitic matrix
sedimentary
Yellow Jasper
Chalcedony (SiO2) with Goethite/Iron oxide inclusions
sedimentary
Poppy Jasper
Jasper (variety of Chalcedony), SiO2 (Silicon Dioxide)
sedimentary
Dyed Imperial Jasper (Sea Sediment Jasper)
Silicon Dioxide (SiO2) - Impure Quartz/Chalcedony
sedimentary