Rock Identifier

Category

Organic Specimen (Fossil)

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

Learn about Organic Specimen (Fossil) in the encyclopedia

Petrified Wood

Amber

Jet

Opalized Wood

Fossilized Shell Fragment (Bivalvia or Gastropoda (Class) fragment) — fossil

Fossilized Shell Fragment

Bivalvia or Gastropoda (Class) fragment

Chert (Arrowhead variety) (Chert (SiO2)) — sedimentary

Chert (Arrowhead variety)

Chert (SiO2)

Chert (often called Flint) (Microcrystalline to cryptocrystalline quartz (SiO2)) — sedimentary

Chert (often called Flint)

Microcrystalline to cryptocrystalline quartz (SiO2)

Iron-stained quartz-rich rock, possibly jasper or chert (Microcrystalline quartz (SiO₂) with iron oxides/hydroxides) — mineral

Iron-stained quartz-rich rock, possibly jasper or chert

Microcrystalline quartz (SiO₂) with iron oxides/hydroxides

Tumbled limestone pebble (Limestone, primarily calcite (CaCO₃)) — sedimentary

Tumbled limestone pebble

Limestone, primarily calcite (CaCO₃)

Chert (and Flint variant) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (and Flint variant)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Pyrite (Fool's Gold) (Iron Disulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Chert Nodules (with Flint core) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Nodules (with Flint core)

Microcrystalline Quartz (SiO2)

Travertine (Terrestrial Sedimentary Limestone (CaCO3)) — sedimentary

Travertine

Terrestrial Sedimentary Limestone (CaCO3)

Chert (Jasper/Agate variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Chert (River Stone) (Silicon Dioxide (SiO2)) — sedimentary

Chert (River Stone)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasperoid) (Silicon Dioxide (SiO2)) — sedimentary

Chert (specifically Flint or Jasperoid)

Silicon Dioxide (SiO2)

Chert (Field Stone) (Microcrystalline / Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Field Stone)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Petrified Wood (Silicified Wood (SiO2)) — mineral

Petrified Wood

Silicified Wood (SiO2)

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

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

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

Chert (Pink Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (Pebble) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (and Limestone) River Cobble (Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)) — sedimentary

Chert (and Limestone) River Cobble

Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

Chert (River Cobble) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (River Cobble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Banded Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Banded Chert

Microcrystalline Quartz (SiO2)

Chert (specifically Gray/Tan Chert Node) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Gray/Tan Chert Node)

Microcrystalline Quartz (SiO2)

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

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Chert (often called Flint or River Stone) (Chert (Microcrystalline Silicon Dioxide, SiO2)) — sedimentary

Chert (often called Flint or River Stone)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Chert (specifically Flint or Jasper variant) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

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

Chert (specifically Flint)

Silicon Dioxide (SiO2)

Oak-grain Laminate (Industrial/Decorative Furniture Finish) (Melamine Resin-impregnated Decorative Paper on Particleboard (Cellulose/Thermosetting Plastic)) — not a rock (synthetic material)

Oak-grain Laminate (Industrial/Decorative Furniture Finish)

Melamine Resin-impregnated Decorative Paper on Particleboard (Cellulose/Thermosetting Plastic)

not a rock (synthetic material)

Chert Concretion with Iron Oxide Staining (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Concretion with Iron Oxide Staining

Microcrystalline Quartz (SiO2)

Chert (and Chalcedony) (Silicon Dioxide (SiO2)) — sedimentary

Chert (and Chalcedony)

Silicon Dioxide (SiO2)

Fossiliferous Limestone (Biogenic Sedimentary Rock (CaCO3)) — sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock (CaCO3)

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

Chert (Jasper-bearing)

Chert (Silicon Dioxide, SiO2)

Brachiopod Fossil (Spiriferid) (Order Spiriferida (Phylum Brachiopoda); mineralized as Calcite (CaCO3) or Chert (SiO2)) — sedimentary (fossilized organic remain)

Brachiopod Fossil (Spiriferid)

Order Spiriferida (Phylum Brachiopoda); mineralized as Calcite (CaCO3) or Chert (SiO2)

sedimentary (fossilized organic remain)

Chert Arrowhead (Chert (Cryptocrystalline variety of Quartz, SiO2)) — sedimentary

Chert Arrowhead

Chert (Cryptocrystalline variety of Quartz, SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Quartz River Pebble with Algae (Silicon Dioxide (SiO2) with organic biofilm) — metamorphic or igneous

Quartz River Pebble with Algae

Silicon Dioxide (SiO2) with organic biofilm

metamorphic or igneous

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

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

Chert (Jasper)

Silicon Dioxide (SiO2)

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

Chert (Jasper)

Silicon Dioxide (SiO2)

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

Chert (often called Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Pyrite (Fool's Gold) (Iron Sulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Chert (with Limestone/Carbonate matrix) (Sedimentary cryptocrystalline silica (SiO2)) — sedimentary

Chert (with Limestone/Carbonate matrix)

Sedimentary cryptocrystalline silica (SiO2)

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

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)