Rock Identifier

Category

Organic (Zoogenic)

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

Learn about Organic (Zoogenic) in the encyclopedia

Sapropel

Bituminous Shale

Bituminous Shale

Black Shale

Petrified Wood

Amber

Jet

Oil Shale

Peat

Pearl

Lizard Skin Jasper

Opalized Wood

Coral Rock

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Shale (Laminated Fissile Pelite) — sedimentary

Shale

Laminated Fissile Pelite

Pearl (Calcium Carbonate (Aragonite) with Conchiolin; formula: CaCO3) — mineral

Pearl

Calcium Carbonate (Aragonite) with Conchiolin; formula: CaCO3

Chert Nodule / Ironstone Concretion (Microcrystalline Quartz (SiO2) with Iron Oxides) — sedimentary

Chert Nodule / Ironstone Concretion

Microcrystalline Quartz (SiO2) with Iron Oxides

Small seashell fossil or shell fragment (Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate) — fossil

Small seashell fossil or shell fragment

Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate

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

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Ironstone Nodules in Chalk/Limestone (Limonite/Goethite concretions (FeO(OH)·nH2O) in Calcium Carbonate matrix (CaCO3)) — sedimentary

Ironstone Nodules in Chalk/Limestone

Limonite/Goethite concretions (FeO(OH)·nH2O) in Calcium Carbonate matrix (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Polished amber-colored stone, possibly chert or jasper (Uncertain from image; likely microcrystalline quartz (SiO₂) if chert/jasper) — mineral

Polished amber-colored stone, possibly chert or jasper

Uncertain from image; likely microcrystalline quartz (SiO₂) if chert/jasper

Weathered limestone or calcareous fossil fragment (Calcite-rich carbonate rock (CaCO₃), possibly fossiliferous limestone) — sedimentary

Weathered limestone or calcareous fossil fragment

Calcite-rich carbonate rock (CaCO₃), possibly fossiliferous limestone

Siltstone with plant fossil impression (Sedimentary rock with Archaeopteris or Calamites flora impression) — fossil

Siltstone with plant fossil impression

Sedimentary rock with Archaeopteris or Calamites flora impression

Granite / Feldspar gravel (Granite (felsic intrusive igneous rock)) — igneous

Granite / Feldspar gravel

Granite (felsic intrusive igneous rock)

Amber (Succinite (Fossilized Tree Resin)) — gemstone

Amber

Succinite (Fossilized Tree Resin)

Moss Agate (Chalcedony (SiO2) with inclusions of hornblende or chlorite) — mineral

Moss Agate

Chalcedony (SiO2) with inclusions of hornblende or chlorite

Amber (Succinite (C10H16O)) — gemstone

Amber

Succinite (C10H16O)

Amber (Succinite (C10H16O)) — gemstone

Amber

Succinite (C10H16O)

Moss Agate / Chalcedony (Silicon Dioxide (SiO2)) — mineral

Moss Agate / Chalcedony

Silicon Dioxide (SiO2)

Moss Agate (Silicon Dioxide (SiO2) with mineral inclusions) — Mineral

Moss Agate

Silicon Dioxide (SiO2) with mineral inclusions

Concretionary Sandstone (Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)) — sedimentary

Concretionary Sandstone

Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)

Sandstone (with potential fossil inclusions) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (with potential fossil inclusions)

Clastic sedimentary rock (primarily SiO2)

Limestone (containing Fossil Mold) (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone (containing Fossil Mold)

Sedimentary Calcium Carbonate (CaCO3)

Moss Agate (Chalcedony (Silicon Dioxide) with inclusions - SiO2) — mineral

Moss Agate

Chalcedony (Silicon Dioxide) with inclusions - SiO2

Amber (Succinite (fossilized resin)) — mineral

Amber

Succinite (fossilized resin)

Amber (Succiniferous fossil resin (C10H16O)) — mineral

Amber

Succiniferous fossil resin (C10H16O)

Moss Agate (Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide) — mineral

Moss Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide

Dendritic Agate (Chalcedony (SiO2) with manganese/iron oxide inclusions) — mineral

Dendritic Agate

Chalcedony (SiO2) with manganese/iron oxide inclusions

Green Moss Agate (Silicon Dioxide with inclusions (SiO2)) — sedimentary

Green Moss Agate

Silicon Dioxide with inclusions (SiO2)

Sandstone Concretion (Sedimentary Clastic Rock (Silicate-rich)) — sedimentary

Sandstone Concretion

Sedimentary Clastic Rock (Silicate-rich)

Amber (Succinite (Formula: C10H16O)) — mineral

Amber

Succinite (Formula: C10H16O)

Amber (specifically Red or Cherry Amber) (Succinite (Resinite); Chemical formula: C10H16O) — Mineraloid

Amber (specifically Red or Cherry Amber)

Succinite (Resinite); Chemical formula: C10H16O

Amber (Fossilized Tree Resin (Succinate)) — mineral

Amber

Fossilized Tree Resin (Succinate)

Zebra Marble (Metamorphosed Limestone (Recrystallized Calcite)) — metamorphic

Zebra Marble

Metamorphosed Limestone (Recrystallized Calcite)

Dinosaur Claw Fossil (Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)) — fossil

Dinosaur Claw Fossil

Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)

Chalk (Calcium Carbonate (CaCO3)) — sedimentary

Chalk

Calcium Carbonate (CaCO3)

Ferruginous Quartz (Silicon Dioxide (SiO2) with Hematite/Limonite impurities) — mineral

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Coquina or Fossiliferous Limestone (Fossiliferous Calcarenite (CaCO3)) — sedimentary

Coquina or Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Angel Skin Coral (Corallium rubrum / Corallium spp. (Calcium Carbonate, CaCO3)) — gemstone

Angel Skin Coral

Corallium rubrum / Corallium spp. (Calcium Carbonate, CaCO3)

Dendritic Agate (Silicon Dioxide with inclusions (SiO2 + Mn/Fe)) — mineral

Dendritic Agate

Silicon Dioxide with inclusions (SiO2 + Mn/Fe)

Polished bloodstone (heliotrope) (Chalcedony (microcrystalline quartz, SiO₂) with red iron-oxide inclusions) — mineral

Polished bloodstone (heliotrope)

Chalcedony (microcrystalline quartz, SiO₂) with red iron-oxide inclusions

Chert (likely flint) (Microcrystalline quartz, SiO₂ (chalcedony/quartz aggregate)) — sedimentary

Chert (likely flint)

Microcrystalline quartz, SiO₂ (chalcedony/quartz aggregate)

Moss-covered Rock Fragment (Weathered Rock Fragment with Epilithic Growth) — sedimentary

Moss-covered Rock Fragment

Weathered Rock Fragment with Epilithic Growth

Weathered flint or chert fragment (Microcrystalline quartz (SiO₂), likely chert/flint) — sedimentary

Weathered flint or chert fragment

Microcrystalline quartz (SiO₂), likely chert/flint