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

Fossiliferous Limestone (Fossiliferous Limestone (Sedimentary Rock)) — fossil

Fossiliferous Limestone

Fossiliferous Limestone (Sedimentary Rock)

Orthoceras Fossil Limestone (Orthoceras (extinct Cephalopod fossil) in Matrix) — sedimentary

Orthoceras Fossil Limestone

Orthoceras (extinct Cephalopod fossil) in Matrix

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Fossilized Rugose Coral (Horn Coral) (Order Rugosa) — sedimentary

Fossilized Rugose Coral (Horn Coral)

Order Rugosa

Coquina / Shelly Limestone (Coquina (Biogenic Limestone)) — sedimentary

Coquina / Shelly Limestone

Coquina (Biogenic Limestone)

Fossilized Shell in Limestone (Carbonate sedimentary rock with Bivalvia or Brachiopoda remains) — fossil

Fossilized Shell in Limestone

Carbonate sedimentary rock with Bivalvia or Brachiopoda remains

Amber (Fossilized tree resin; chiefly organic terpenoid polymers (succinite)) — gemstone

Amber

Fossilized tree resin; chiefly organic terpenoid polymers (succinite)

Petrified Wood (Silicified wood (primarily Silicon Dioxide, SiO2)) — metamorphic

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Fossilized coral or silicified organic limestone (Likely fossil coral (Scleractinia/Tabulata) replaced or cemented by calcite and silica; exact identification requires close examination) — fossil

Fossilized coral or silicified organic limestone

Likely fossil coral (Scleractinia/Tabulata) replaced or cemented by calcite and silica; exact identification requires close examination

Amber with dark mineral/organic inclusions (Fossilized plant resin (amber; chiefly polymerized diterpenoid resin)) — gemstone

Amber with dark mineral/organic inclusions

Fossilized plant resin (amber; chiefly polymerized diterpenoid resin)

Banded chert or flint (Microcrystalline quartz (SiO₂), commonly called chert/flint) — sedimentary

Banded chert or flint

Microcrystalline quartz (SiO₂), commonly called chert/flint

Amber (Succinite (Fossilized Resin)) — gemstone

Amber

Succinite (Fossilized Resin)

Amber (Succinited (fossilized tree resin)) — fossil

Amber

Succinited (fossilized tree resin)

Amber (Copal) (Succinite (fossilized resin)) — mineral

Amber (Copal)

Succinite (fossilized resin)

Dendritic Agate (Tree Agate) (Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions) — mineral

Dendritic Agate (Tree Agate)

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Likely tumbled yellow calcite or limestone fragment (Calcite (CaCO₃), possibly micritic limestone) — mineral

Likely tumbled yellow calcite or limestone fragment

Calcite (CaCO₃), possibly micritic limestone

Banded calcite (travertine or calcite-rich carbonate) (Calcite, CaCO₃; likely banded travertine or recrystallized limestone) — sedimentary

Banded calcite (travertine or calcite-rich carbonate)

Calcite, CaCO₃; likely banded travertine or recrystallized limestone

Dendritic jasper/chalcedony (Silica-rich microcrystalline quartz (SiO₂) with manganese-oxide dendrites) — mineral

Dendritic jasper/chalcedony

Silica-rich microcrystalline quartz (SiO₂) with manganese-oxide dendrites

Dark gray flint or chert fragment (Microcrystalline quartz (SiO₂), commonly with minor chalcedony and impurities) — sedimentary

Dark gray flint or chert fragment

Microcrystalline quartz (SiO₂), commonly with minor chalcedony and impurities

Polished plume agate (Chalcedony (microcrystalline SiO₂) with iron-oxide inclusions) — mineral

Polished plume agate

Chalcedony (microcrystalline SiO₂) with iron-oxide inclusions

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Amber (Succinate (Succinite for Baltic varieties)) — Organic Mineraloid

Amber

Succinate (Succinite for Baltic varieties)

Organic Mineraloid

Limestone (River Pebble) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (River Pebble)

Calcium Carbonate (CaCO3)

Agate (Moss or Green Agate) (Silicon Dioxide (SiO2)) — mineral

Agate (Moss or Green Agate)

Silicon Dioxide (SiO2)

Pearls (Pearl: biomineralized aragonite (CaCO₃) and conchiolin) — gemstone

Pearls

Pearl: biomineralized aragonite (CaCO₃) and conchiolin

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

Moss Agate

Silicon Dioxide with inclusions (SiO2)

Flint / Chert Nodule (Microcrystalline quartz (SiO2)) — sedimentary

Flint / Chert Nodule

Microcrystalline quartz (SiO2)

Amber (Succinite (approximate formula C10H16O)) — mineraloid

Amber

Succinite (approximate formula C10H16O)

Amber (Succinite (approximate formula C10H16O)) — mineral

Amber

Succinite (approximate formula C10H16O)

Amber (Succinite (with approximate formula C10H16O)) — mineraloid

Amber

Succinite (with approximate formula C10H16O)

Green Moss Agate (Agate (Silicon Dioxide, SiO2) with inclusions of hornblende or chlorite) — mineral

Green Moss Agate

Agate (Silicon Dioxide, SiO2) with inclusions of hornblende or chlorite

Dendritic Agate (Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)) — mineral

Dendritic Agate

Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)

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

Moss Agate

Chalcedony (Silicon Dioxide, SiO2) with inclusions

Fossilized wood or plant fragment (Petrified wood (silicified fossil wood; commonly Araucarioxylon or related taxa)) — fossil

Fossilized wood or plant fragment

Petrified wood (silicified fossil wood; commonly Araucarioxylon or related taxa)

Fossiliferous Chert (with Fossil Shells) (Silicon Dioxide (SiO2) with biogenic inclusions) — sedimentary

Fossiliferous Chert (with Fossil Shells)

Silicon Dioxide (SiO2) with biogenic inclusions

Limonite (Iron Ore) (Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

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

Travertine (Calcareous Tufa / Travertine (CaCO3)) — sedimentary

Travertine

Calcareous Tufa / Travertine (CaCO3)

Fossiliferous Limestone (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Sandstone with Brachiopod Mold Fossil (Sedimentary rock (Sandstone) with indeterminate Brachiopod mold) — fossil

Sandstone with Brachiopod Mold Fossil

Sedimentary rock (Sandstone) with indeterminate Brachiopod mold

Raw amber (Fossilized tree resin; primarily polymerized terpenoid resin (succinite when Baltic-type)) — gemstone

Raw amber

Fossilized tree resin; primarily polymerized terpenoid resin (succinite when Baltic-type)

Carved red coral bead (likely coral or coral-colored resin) (Corallium spp. (precious coral; calcium carbonate, CaCO₃)) — gemstone

Carved red coral bead (likely coral or coral-colored resin)

Corallium spp. (precious coral; calcium carbonate, CaCO₃)