Chert / Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Category
Sedimentary (Fossiliferous)
Browse sedimentary (fossiliferous) specimens identified by the Rock Identifier community.
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Painted Garden Rock
Coated Siltstone or Mudstone
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Caribbean Calcite
Calcium Carbonate with Argonite (CaCO3)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Chert (Common Opal/Jasper transition)
Silicon Dioxide (SiO2)
sedimentary
Black Opal (Triplet)
Hydrated Silica (SiO2·nH2O)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Limestone
Calcite (CaCO3)
sedimentary
Ferruginous Siltstone
Siltstone with Magnetite/Hematite bands
sedimentary
Sandstone (Quartzite-rich Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Pebble)
Arenite
sedimentary
Red Jasper (or Banded Jasper)
Silicon Dioxide (SiO2 with Hematite impurities)
mineral
Sandstone Pebble
Arenite
sedimentary
Common Opal / Chert
Hydrated silica (SiO2·nH2O) or Microcrystalline Quartz (SiO2)
mineral
Fossil Sponge / Horn Coral / Crinoid Stem
Phylum Porifera or Cnidaria fossilized in calcium carbonate / silica
fossil
Glauconitic Sandstone
Glauconitic Sandstone (Quartz with Glauconite)
sedimentary
Chert (Sedimentary Rock)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (likely Graywacke or Lithic Arenite)
Clastic sedimentary rock predominantly composed of silicate grains
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Red Jasper (or Agate/Jasper mixture)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Chert (Agatized/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Sandstone (Red Arkose)
Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)
sedimentary
Chert (specifically Gray/Blue-Gray Chert)
Chert (SiO2)
sedimentary
Quartzite Conglomerate
Conglomerate (SiO2 rich)
sedimentary
Magnetite / Ironstone
Magnetite (Fe3O4)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Red Jasper (Quartz)
Silicon Dioxide (SiO2) with Iron impurities
sedimentary
Red Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) within a sedimentary or igneous host
sedimentary
Brachiopod Fossil in Matrix
Phylum Brachiopoda
fossil
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Glauconitic Sandstone
Glauconitic sandstone ((K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Sandstone or Siltstone
Arenite or Siltstone
sedimentary
Fossilized Fish Skeleton in Matrix
Vertebrata (Class: Actinopterygii), typically found in limestone or shale matrices
sedimentary
Sedimentary River Rock
Siliciclastic Sedimentary Rock (Quartzite or Sandstone pebble)
sedimentary