Chert (including Common Opal and Chalcedony)
Silicon Dioxide (SiO2 · nH2O)
sedimentary
Category
Sedimentary (Formed From Silica Deposits)
Browse sedimentary (formed from silica deposits) specimens identified by the Rock Identifier community.
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Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Raw Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Conglomerate
Conglomerate
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Polished red jasper and carnelian specimens
Jasper: microcrystalline quartz (SiO₂) colored by iron oxides; carnelian: orange-red chalcedony, also SiO₂
mineral
Quartz / Common Agate
Silicon Dioxide (SiO2)
mineral
Likely brown chert (flint) fragment
Microcrystalline quartz (SiO₂), commonly called chert
sedimentary
Jasper Breccia
Silicon Dioxide (SiO2) with impurities
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chert Nodule in Limestone Host)
Chert (SiO2)
sedimentary
Jasper
Silicon dioxide (Microcrystalline quartz, SiO2)
sedimentary
Tumbled jasper or chert fragment
Microcrystalline quartz (SiO₂), likely jasper/chert with iron-oxide staining
mineral
Chert (often called Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Tumbled yellow chalcedony (likely yellow jasper)
Microcrystalline quartz, SiO₂; chalcedony/jasper variety
mineral
Chert / Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2)
mineral
Amethyst Geode
Silicon Dioxide (SiO2) with iron impurities
mineral
Chert (Common Opal/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (varieties include Flint and Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Red Jasper
Red Jasper (SiO2) with Hematite inclusions
sedimentary
Red Jasper
Jasper (Silicon Dioxide Si₂O₃)
sedimentary
Banded iron formation (ironstone)
BIF; alternating hematite/magnetite and chert (SiO₂) layers
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Ferric Iron inclusions
sedimentary
Mixed collection of minerals and rocks (Jasper, Carnelian, Granite, and Quartz)
Silicon Dioxide (SiO2) with varying impurities for silicates and igneous aggregates
igneous, sedimentary, and metamorphic
Chert / Flint with Cortex
Silicon Dioxide (SiO2)
sedimentary
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Galena (likely)
Galena, lead sulfide (PbS)
mineral
Quartzite (River Stone)
Quartzite (mainly SiO2 with iron oxide staining)
metamorphic
Botryoidal chalcedony (possibly agate/geode material)
Chalcedony, microcrystalline quartz (SiO₂)
mineral
Red Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Agatized Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide) - SiO2
sedimentary
Chert (Chalcedony/Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Carnelian
Carnelian (Silica, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Megalodon Shark Tooth Fossil
Otodus megalodon
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral