Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Category
Sedimentary (Biogenic)
Browse sedimentary (biogenic) specimens identified by the Rock Identifier community.
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Sandstone (Ferruginous)
Arenite with iron oxide cement (Fe2O3)
sedimentary
Chert (Chalcedony/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth
Eocene Lamniformes (Mackerel Shark clade)
fossil
Chert / Flint Pebble
Silicon Dioxide (SiO2)
sedimentary
Crinoidean Fossil (Stem Fragment)
Phylum Echinodermata, Class Crinoidea
fossil
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Conglomerate
Conglomerate (SiO2, CaCO3 dominant)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Banded Flint / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Red)
Arenite (Fe2O3 heavy)
sedimentary
Yellow Chert (River Stone)
Chert (SiO2)
sedimentary
Sandstone (Micaceous)
Arenite (primarily SiO2 with Phyllosilicates)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Sandstone (Painted)
Arenite (primarily SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Chert (often called Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone Concretion
Clastic sedimentary rock (primarily Silica, SiO2, or Calcium Carbonate, CaCO3)
sedimentary
Sandstone (likely Arkose or Quartz Sandstone)
Arenite (SiO2 + varied clasts)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodule)
Chert (Silicon Dioxide, SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Piddock bored rock (likely Mudstone or Shale)
Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Celestite
Strontium Sulfate (SrSO4)
mineral
Rhodochrosite
Rhodochrosite, Manganese Carbonate (MnCO3)
mineral
Limonite (Iron Stone/Ocher)
Limonite (FeO(OH)·nH2O)
mineral
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Chalcedony (Agate/Carnelian)
Cryptocrystalline Quartz (SiO2)
mineral
Sulfur (on Matrix)
Native Sulfur (S8)
mineral
Orange Quartz (Tangerine Quartz)
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Jasper
Silicon dioxide, SiO2
Mineral
Celestite (Celestine) Geode
Strontium Sulfate (SrSO4)
mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary