Rock Identifier

Category

Sedimentary (Silicified Fossiliferous Chalcedony)

Browse sedimentary (silicified fossiliferous chalcedony) specimens identified by the Rock Identifier community.

Sandstone (Quartzite Pebble) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzite Pebble)

Arenite (primarily SiO2)

Chert (Nodule) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Milky Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Red Siltstone (Siltstone (primarily quartz and feldspar sized 0.0039 to 0.0625 mm)) — sedimentary

Red Siltstone

Siltstone (primarily quartz and feldspar sized 0.0039 to 0.0625 mm)

Sandstone (Ferruginous) (Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)) — sedimentary

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Sandstone (with Liesegang rings or Oxidation) (Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)) — sedimentary

Sandstone (with Liesegang rings or Oxidation)

Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)

Ammonite Fossil (Ammonitida (Extinct subclass of Cephalopoda)) — sedimentary

Ammonite Fossil

Ammonitida (Extinct subclass of Cephalopoda)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Jasper/River Stone) (Silicon dioxide (SiO2) - Microcrystalline quartz) — sedimentary

Chert (Jasper/River Stone)

Silicon dioxide (SiO2) - Microcrystalline quartz

Fossil Shell (Bivalve) (Phylum Mollusca, Class Bivalvia (typically composed of Calcium Carbonate / CaCO3)) — sedimentary

Fossil Shell (Bivalve)

Phylum Mollusca, Class Bivalvia (typically composed of Calcium Carbonate / CaCO3)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Sandstone (Ferruginous) (Arenite (composed primarily of SiO2 with Fe2O3 cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Chert (Yellow/Tan) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow/Tan)

Microcrystalline Quartz (SiO2)

Siltstone (Siltstone (primarily SiO2, Al2O3)) — sedimentary

Siltstone

Siltstone (primarily SiO2, Al2O3)

Quartz (Common Quartz Pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (Common Quartz Pebble)

Silicon Dioxide (SiO2)

Sandstone (Arenite (SiO2, often with CaCO3 or Fe2O3 cement)) — sedimentary

Sandstone

Arenite (SiO2, often with CaCO3 or Fe2O3 cement)

Sandstone with Ironstone Banding (Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)) — sedimentary

Sandstone with Ironstone Banding

Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)

Chert (Flint) (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Milky Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Chert (often called Flint) (Chert (SiO2)) — sedimentary

Chert (often called Flint)

Chert (SiO2)

Milky Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Limestone (Concretionary or Tufa) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (Concretionary or Tufa)

Calcium Carbonate (CaCO3)

Chert (specifically Flint or Common Opal variant) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Flint or Common Opal variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (Ferruginous) (Arenite (composed primarily of SiO2 with Fe2O3 cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Yellow Quartzite Pebble (Quartzite (SiO2)) — metamorphic

Yellow Quartzite Pebble

Quartzite (SiO2)

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Concretion with Quartz Veining (Septarian Concretion (CaCO3 / SiO2)) — sedimentary

Concretion with Quartz Veining

Septarian Concretion (CaCO3 / SiO2)

Chert (Red/Brown Variety) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Red/Brown Variety)

Microcrystalline quartz (SiO2)

Chert (Flint variety) (Chert (Cryptocrystalline Quartz, SiO2)) — sedimentary

Chert (Flint variety)

Chert (Cryptocrystalline Quartz, SiO2)

Greywacke (likely) (Greywacke (a type of sandstone)) — Sedimentary

Greywacke (likely)

Greywacke (a type of sandstone)

Ferruginous Sandstone (River Pebble) (Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 cement)) — sedimentary

Ferruginous Sandstone (River Pebble)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 cement)

Sandstone (likely Arkosic or Lithic Sandstone) (Arenite (SiO2 based with mineral inclusions)) — sedimentary

Sandstone (likely Arkosic or Lithic Sandstone)

Arenite (SiO2 based with mineral inclusions)

Granular Sandstone (Arenite (variable composition, primarily SiO2)) — sedimentary

Granular Sandstone

Arenite (variable composition, primarily SiO2)

Sandstone (Ferruginous) (Arenite (complex silicate composition with iron oxides)) — sedimentary

Sandstone (Ferruginous)

Arenite (complex silicate composition with iron oxides)

Sandstone (Ferruginous) (Arenite (SiO2 with iron oxide impurities)) — sedimentary

Sandstone (Ferruginous)

Arenite (SiO2 with iron oxide impurities)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Red Sandstone (Arenite (primarily Quartz with Iron Oxide)) — sedimentary

Red Sandstone

Arenite (primarily Quartz with Iron Oxide)