Druzy Quartz Geode (Oco or Moroccan variety)
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary (Silicified Fossiliferous Chalcedony)
Browse sedimentary (silicified fossiliferous chalcedony) specimens identified by the Rock Identifier community.
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Chert (Jasper/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and Agate/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Chalcedony)
Microcrystalline Silica (SiO2)
sedimentary
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Chalcedony Nodules
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Geode with Quartz/Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper (likely red/brown jasper)
Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides
mineral
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with iron and other mineral inclusions
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
sedimentary
Jasper and Quartz River Cobble
Silicon Dioxide (SiO2) with Hematite inclusions
Sedimentary / Metamorphic
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in a Geode
mineral
Carnelian
Carnelian (Silicon Dioxide - SiO2)
mineral
Quartz (chalcedony variety) or Limestone with Quartz Veins
SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)
Mineral or Sedimentary Rock (with mineral inclusions)
Flint in Chalk
Sedimentary nodular chert within chalk (SiO2)
sedimentary
Agate / Banded Chalcedony
Agate (Silicon Dioxide / SiO2)
mineral
Chert / Chalcedony Nodules
Silicon Dioxide (SiO2)
sedimentary
Carnelian
Silicon Dioxide (Chalcedony variety), SiO2
mineral
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Banded Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Carnelian Agate
Chalcedony (SiO2) with iron oxide inclusions
mineral
Tumbled quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly weathered chert or chalcedony
mineral
Botryoidal Chalcedony in Geode/Vug
Silicon Dioxide (SiO2)
mineral
Geode (Unopened)
Quartz Geode (SiO2) / Chalcedony Concretion
mineral
Blue Agate (Dyed Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Flint (or Chert)
Silicon dioxide (SiO2) microcrystalline quartz
sedimentary
Tumbled blue chalcedony or pale aquamarine-like quartz
Chalcedony (microcrystalline SiO₂), possibly blue quartz; visual identification is uncertain
mineral
Yellow Jasper
Jasper (variety of Quartz - SiO2)
sedimentary
Carnelian
Carnelian (Silicon Dioxide - SiO2 with Hematite impurities)
Mineral
Geode (Quartz / Chalcedony Geode)
SiO2 (Silicon Dioxide)
sedimentary
Black Onyx
Cryptocrystalline Quartz (SiO2 with organic/iron impurities)
mineral
Seam Agate
Agate (Banded variety of Chalcedony, SiO2)
mineral
Banded Agate (specifically Carnelian Agate)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Polished brown jasper (likely ocean or brecciated jasper)
Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides
mineral
Zebra Jasper (with Chlorite/Epidote)
Silicon Dioxide (SiO2) with inclusions
sedimentary
Brecciated jasper/chalcedony (iron-stained silica)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Dendritic Agate (specifically Orange/Tumbled)
Silicon Dioxide (SiO2) with Oxide Inclusions
mineral
Quartz pebble (Chert / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Chert / Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Weathered quartz-rich rock, likely quartzite or altered sandstone
Quartzite (mostly microcrystalline quartz, SiO₂); exact identification is uncertain from the photograph
metamorphic