Rock Identifier

Category

Igneous And Fossil

Browse igneous and fossil specimens identified by the Rock Identifier community.

Learn about Igneous And Fossil in the encyclopedia

Fossil Opal

Bone Opal

Turritella Jasper

Amber

Fossiliferous Limestone

Fossiliferous Limestone

Turritella Agate

Turritella Agate

Petrified Wood

Carbonatite

Diatomite

Guano

Jet

Diatomaceous Earth

Sandstone (Ferruginous) (Arenite with Iron Oxide (Limonite/Hematite) coating) — sedimentary

Sandstone (Ferruginous)

Arenite with Iron Oxide (Limonite/Hematite) coating

Sandstone (likely Siltstone variety) (Arenite / Siltstone (primary mineral SiO2)) — sedimentary

Sandstone (likely Siltstone variety)

Arenite / Siltstone (primary mineral SiO2)

Sandstone (Pebble/Cobble) (Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)) — Sedimentary

Sandstone (Pebble/Cobble)

Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)

Silty Shale (Silty Shale (Fissile Sedimentary Rock)) — sedimentary

Silty Shale

Silty Shale (Fissile Sedimentary Rock)

Shale (sub-type: Carbonaceous Shale) (Lutaceous Sedimentary Rock) — sedimentary

Shale (sub-type: Carbonaceous Shale)

Lutaceous Sedimentary Rock

Ferruginous Sandstone (Arenite with Hematite/Limonite cement) — sedimentary

Ferruginous Sandstone

Arenite with Hematite/Limonite cement

Sandstone (Ferruginous) (Arenite with Iron-Oxide cement) — sedimentary

Sandstone (Ferruginous)

Arenite with Iron-Oxide cement

Marble (Metamorphosed Limestone (CaCO3)) — metamorphic

Marble

Metamorphosed Limestone (CaCO3)

Chert (often called Flint in this variation) (Silicon dioxide (SiO2) - Microcrystalline quartz) — sedimentary

Chert (often called Flint in this variation)

Silicon dioxide (SiO2) - Microcrystalline quartz

Slate (Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)) — metamorphic

Slate

Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)

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

Sandstone (Pebble)

Arenite (primarily SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Chert (Nodule) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Nodule)

Silicon Dioxide (SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Red Sandstone (Arenite (primarily SiO2 with Fe2O3)) — sedimentary

Red Sandstone

Arenite (primarily SiO2 with Fe2O3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Kambaba Jasper (Stromatolite) — sedimentary/fossil

Kambaba Jasper

Stromatolite

sedimentary/fossil

Fossilized Chiton (Polyplacophora) (Polyplacophora (fossilized valves)) — mineralized fossil

Fossilized Chiton (Polyplacophora)

Polyplacophora (fossilized valves)

mineralized fossil

Petrified Wood (Fossilized wood / Silicified wood) — Sedimentary / Fossil

Petrified Wood

Fossilized wood / Silicified wood

Sedimentary / Fossil

Ironstone Concretion (Ferruginous Sandstone / Hematite-rich Concretion) — sedimentary

Ironstone Concretion

Ferruginous Sandstone / Hematite-rich Concretion

Red Sandstone (Ferruginous Sandstone (SiO2 with Fe2O3)) — sedimentary

Red Sandstone

Ferruginous Sandstone (SiO2 with Fe2O3)

Chert (Jasper) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Siltstone (Siltstone (Detrital Clastic Sedimentary Rock)) — sedimentary

Siltstone

Siltstone (Detrital Clastic Sedimentary Rock)

Shale with Iron Staining (Fissile Mudrock (Sedimentary Rock)) — sedimentary

Shale with Iron Staining

Fissile Mudrock (Sedimentary Rock)

Shale (Shale (Fissile Mudstone)) — sedimentary

Shale

Shale (Fissile Mudstone)

Chert with Manganese Dendrites / River Silt Overlays (Cryptocrystalline Quartz (SiO2) with Manganese Oxides) — sedimentary

Chert with Manganese Dendrites / River Silt Overlays

Cryptocrystalline Quartz (SiO2) with Manganese Oxides

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Siltstone (Siltstone (Siliclastic sedimentary rock)) — sedimentary

Siltstone

Siltstone (Siliclastic sedimentary rock)

Sandstone (Ferruginous) (Arenite (Fe-oxide cemented)) — sedimentary

Sandstone (Ferruginous)

Arenite (Fe-oxide cemented)

Chert (often called Flint or Jasper if reddish) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint or Jasper if reddish)

Microcrystalline Quartz (SiO2)

River Pebble (Siltstone/Mudstone) (Clastic sedimentary rock) — sedimentary

River Pebble (Siltstone/Mudstone)

Clastic sedimentary rock

Chert (specifically a nodule with Chalcendony/Agate banding) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (specifically a nodule with Chalcendony/Agate banding)

Microcrystalline Quartz (SiO2)

Stromatolite (Laminated biogenic sedimentary structure (formed by Cyanobacteria)) — sedimentary

Stromatolite

Laminated biogenic sedimentary structure (formed by Cyanobacteria)

Shale (Mudstone/Shale) — sedimentary

Shale

Mudstone/Shale

Marble (Recrystallized Calcite (CaCO3)) — metamorphic

Marble

Recrystallized Calcite (CaCO3)

Chert (vuggy variety) (Microcrystalline silica (SiO2)) — sedimentary

Chert (vuggy variety)

Microcrystalline silica (SiO2)

Limestone (likely weathered) (Limestone (Mainly Calcium Carbonate, CaCO3)) — sedimentary

Limestone (likely weathered)

Limestone (Mainly Calcium Carbonate, CaCO3)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Chert Nodule in Limestone (Microcrystalline Silica (SiO2) within Calcium Carbonate (CaCO3)) — sedimentary

Chert Nodule in Limestone

Microcrystalline Silica (SiO2) within Calcium Carbonate (CaCO3)

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

Chert Concretion

Chert (Microcrystalline Quartz, SiO2)

Sandstone (Arenite (SiO2 principal component)) — sedimentary

Sandstone

Arenite (SiO2 principal component)

Shale (Argillite / Shale) — sedimentary

Shale

Argillite / Shale