Rock Identifier

Category

Sedimentary (Fossil)

Browse sedimentary (fossil) specimens identified by the Rock Identifier community.

Chert (Arrowhead/Artifact Fragment) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint or Jasper depending on color) (Chert (SiO2 - Microcrystalline or Cryptocrystalline Quartz)) — sedimentary

Chert (often called Flint or Jasper depending on color)

Chert (SiO2 - Microcrystalline or Cryptocrystalline Quartz)

Metaconglomerate (Protolith: Conglomerate (comprising SiO2, Al2O3, etc.)) — metamorphic

Metaconglomerate

Protolith: Conglomerate (comprising SiO2, Al2O3, etc.)

Quartz Crystal (Quartz (SiO₂)) — Mineral

Quartz Crystal

Quartz (SiO₂)

Quartz (Silicon Dioxide (SiO2)) — Mineral

Quartz

Silicon Dioxide (SiO2)

Pyrite (Pyrite (FeS2)) — Mineral

Pyrite

Pyrite (FeS2)

Chert (Chert / Flint) (Silicon dioxide (SiO2) - Microcrystalline quartz) — sedimentary

Chert (Chert / Flint)

Silicon dioxide (SiO2) - Microcrystalline quartz

Chert (Black Chert/Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Black Chert/Flint)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous) (Arenite (Fe2O3 dominant staining)) — sedimentary

Sandstone (Ferruginous)

Arenite (Fe2O3 dominant staining)

Red Sandstone (Arenite (high iron oxide content)) — sedimentary

Red Sandstone

Arenite (high iron oxide content)

Chert (Jasper-bearing) (Chert (Silicon Dioxide, SiO2)) — sedimentary

Chert (Jasper-bearing)

Chert (Silicon Dioxide, SiO2)

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

Chert (Nodule)

Silicon Dioxide (SiO2)

Red Sandstone (Iron-rich) (Ferruginous Sandstone (variable formula, primarily SiO2 + Fe2O3)) — sedimentary

Red Sandstone (Iron-rich)

Ferruginous Sandstone (variable formula, primarily SiO2 + Fe2O3)

Pyrite in Shale (Iron Sulfide (FeS2) in Argillaceous Shale) — sedimentary

Pyrite in Shale

Iron Sulfide (FeS2) in Argillaceous Shale

Fancy Jasper (Silicon Dioxide (SiO2) with mineral inclusions) — sedimentary

Fancy Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Chert (with Iron Staining) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (with Iron Staining)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (Grooved/Weathered) (Arenite (composed primarily of Quartz and Lithic fragments)) — sedimentary

Sandstone (Grooved/Weathered)

Arenite (composed primarily of Quartz and Lithic fragments)

Chert (Flint variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Flint variety)

Silicon Dioxide (SiO2)

Red Jasper (Mahogany Obsidian variant similarity) (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Red Jasper (Mahogany Obsidian variant similarity)

Silicon Dioxide (SiO2) with iron oxide inclusions

Fossilized Pycnodonte Oyster (Pycnodonte (Gryphaeostrea) species; Composition is Calcium Carbonate (Calcite/Aragonite)) — sedimentary

Fossilized Pycnodonte Oyster

Pycnodonte (Gryphaeostrea) species; Composition is Calcium Carbonate (Calcite/Aragonite)

Brown Jasper (Silicon Dioxide (SiO2)) — sedimentary

Brown Jasper

Silicon Dioxide (SiO2)

Chert (Flint Pebbles) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint Pebbles)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Red Chert

Microcrystalline Quartz (SiO2)

Chert (variations include Flint/Jasper) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (variations include Flint/Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (and Chert-based Jasper) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — Sedimentary

Chert (and Chert-based Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Yellow Quartzite or Yellow Jasper (Quartzite (primarily SiO2 with Iron oxide staining)) — metamorphic

Yellow Quartzite or Yellow Jasper

Quartzite (primarily SiO2 with Iron oxide staining)

Amber (Succinicum (Formula: C10H16O)) — Mineraloid

Amber

Succinicum (Formula: C10H16O)

Quartzite River Rock (Quartzite (primarily SiO2)) — metamorphic

Quartzite River Rock

Quartzite (primarily SiO2)

Quartz (Druzy) (Silicon Dioxide (SiO2)) — mineral

Quartz (Druzy)

Silicon Dioxide (SiO2)

Quartz Druze on Matrix (Silicon Dioxide (SiO2)) — mineral

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Limonite (Hydrated Iron Oxide / Bog Iron) (FeO(OH)·nH2O) — Mineral (Sedimentary context)

Limonite (Hydrated Iron Oxide / Bog Iron)

FeO(OH)·nH2O

Mineral (Sedimentary context)

Quartz Geode (likely within Limestone or Dolomite matrix) (Quartz (SiO₂)) — Mineral within a Sedimentary Rock

Quartz Geode (likely within Limestone or Dolomite matrix)

Quartz (SiO₂)

Mineral within a Sedimentary Rock

Limonite (Yellow Ochre) (Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)) — mineral

Limonite (Yellow Ochre)

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Petrified Wood (Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)) — metamorphic

Petrified Wood

Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)

Quartzite (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Carnelian (Carnelian (SiO2 with Iron Oxide impurities)) — mineral

Carnelian

Carnelian (SiO2 with Iron Oxide impurities)

Banded Slate or Siltstone with Quartz/Calcite Veins (Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)) — metamorphic

Banded Slate or Siltstone with Quartz/Calcite Veins

Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)

Quartzite River Stone (Quartzite (primarily SiO2)) — metamorphic

Quartzite River Stone

Quartzite (primarily SiO2)

Precious Opal (Hydrated amorphous silica (SiO2·nH2O)) — mineral

Precious Opal

Hydrated amorphous silica (SiO2·nH2O)

Fossilized Shark Tooth (Otodus obliquus) (Otodus obliquus (composed primarily of Fluorapatite)) — mineral

Fossilized Shark Tooth (Otodus obliquus)

Otodus obliquus (composed primarily of Fluorapatite)

Hematite / Goethite (Iron Ore) (Iron Oxide (Fe2O3 / FeO(OH))) — mineral

Hematite / Goethite (Iron Ore)

Iron Oxide (Fe2O3 / FeO(OH))