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

Pyrite in Shale (Iron Disulfide (FeS2)) — mineral

Pyrite in Shale

Iron Disulfide (FeS2)

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

Chert (Arrowhead variety)

Chert (SiO2)

Chert Nodule (Flint) (Cryptocrystalline quartz (SiO2)) — sedimentary

Chert Nodule (Flint)

Cryptocrystalline quartz (SiO2)

Mother of Pearl and Onyx (Aragonite (Mother of Pearl) and Chalcedony (Onyx)) — mineral

Mother of Pearl and Onyx

Aragonite (Mother of Pearl) and Chalcedony (Onyx)

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

Chert (Flint)

Silicon Dioxide (SiO2)

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

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

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

Chert (Jasper)

Cryptocrystalline Quartz (SiO2)

Red Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Red Chert

Microcrystalline Quartz (SiO2)

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

Chert (Flint/Jasper)

Silicon Dioxide (SiO2)

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

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

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

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Garden Quartz (Included Quartz (SiO2 with accessory minerals such as Chlorite, Hematite, or Feldspar)) — mineral

Garden Quartz

Included Quartz (SiO2 with accessory minerals such as Chlorite, Hematite, or Feldspar)

Petrified wood (Silicified fossil wood, primarily quartz (SiO₂) replacing cellulose) — fossil

Petrified wood

Silicified fossil wood, primarily quartz (SiO₂) replacing cellulose

Fossil gastropod shell (Fossilized marine gastropod; exact genus/species cannot be determined from the image) — fossil

Fossil gastropod shell

Fossilized marine gastropod; exact genus/species cannot be determined from the image

Mocha Stone (Dendritic Agate) (Silicon Dioxide (SiO2) with Manganese/Iron inclusions) — sedimentary

Mocha Stone (Dendritic Agate)

Silicon Dioxide (SiO2) with Manganese/Iron inclusions

Limestone (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Moss-covered Limestone with Quartz/Calcite Pocket (Calcium Carbonate (CaCO3) rock with biological moss coating) — sedimentary

Moss-covered Limestone with Quartz/Calcite Pocket

Calcium Carbonate (CaCO3) rock with biological moss coating

Shale (or Slate / Coal / Jet) (Laminated fine-grained sedimentary rock (predominantly clay minerals)) — sedimentary

Shale (or Slate / Coal / Jet)

Laminated fine-grained sedimentary rock (predominantly clay minerals)

Polished amber (Fossilized tree resin (primarily organic polymerized diterpenes)) — gemstone

Polished amber

Fossilized tree resin (primarily organic polymerized diterpenes)

Shale with Coprolite influence (Argillaceous sedimentary rock (Shale/Mudstone)) — sedimentary

Shale with Coprolite influence

Argillaceous sedimentary rock (Shale/Mudstone)

Fossiliferous Sandstone / Mudstone (Sedimentary Rock (Clastic with Fossiliferous Inclusions)) — sedimentary

Fossiliferous Sandstone / Mudstone

Sedimentary Rock (Clastic with Fossiliferous Inclusions)

Glauconite (Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2) — mineral

Glauconite

Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2

Bituminous Coal (with Anthracite or Vitrinite inclusion) (Organic-rich Sedimentary Rock (Carboniferous classification)) — sedimentary

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Baltic Amber (Succinite (Fossilized Tree Resin)) — fossil

Baltic Amber

Succinite (Fossilized Tree Resin)

Fossilized Rugose Coral in Limestone (Order Rugosa in Sedimentary Matrix (CaCO3)) — fossil

Fossilized Rugose Coral in Limestone

Order Rugosa in Sedimentary Matrix (CaCO3)

Coal (Anthracite or Bituminous Coal) — sedimentary

Coal

Anthracite or Bituminous Coal

Cardstock (Paper) (Cellulose (C6H10O5)n) — sedimentary (man-made)

Cardstock (Paper)

Cellulose (C6H10O5)n

sedimentary (man-made)

Petrified Wood (Silicified Wood (SiO2 permineralization)) — sedimentary

Petrified Wood

Silicified Wood (SiO2 permineralization)

Fossil Shell Fragment (possibly Brachiopod or Bivalve) (Calcium Carbonate (CaCO3) - Phylum Brachiopoda or Mollusca) — sedimentary

Fossil Shell Fragment (possibly Brachiopod or Bivalve)

Calcium Carbonate (CaCO3) - Phylum Brachiopoda or Mollusca

Human Skin (Epidermis/Dermis) (Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)) — Mineral-like biological tissue

Human Skin (Epidermis/Dermis)

Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)

Mineral-like biological tissue

Likely coal (possibly anthracite) (Coal, composed chiefly of carbon-rich organic matter; rank cannot be confirmed from the photograph) — sedimentary

Likely coal (possibly anthracite)

Coal, composed chiefly of carbon-rich organic matter; rank cannot be confirmed from the photograph

Black Marble (Veined Limestone/Marble) (Recrystallized Limestone / Metamorphic Calcite (CaCO3)) — metamorphic

Black Marble (Veined Limestone/Marble)

Recrystallized Limestone / Metamorphic Calcite (CaCO3)

Tumbled brown chert (likely flint) (Microcrystalline quartz/chalcedony, SiO₂) — sedimentary

Tumbled brown chert (likely flint)

Microcrystalline quartz/chalcedony, SiO₂

Fossiliferous limestone (Bioclastic carbonate rock; predominantly calcite (CaCO₃)) — sedimentary

Fossiliferous limestone

Bioclastic carbonate rock; predominantly calcite (CaCO₃)

Fossilized bone fragment (Petrified vertebrate bone; mineralized hydroxyapatite replaced or infilled by silica/carbonates) — fossil

Fossilized bone fragment

Petrified vertebrate bone; mineralized hydroxyapatite replaced or infilled by silica/carbonates

Polished amber (likely copal or amber) (Fossilized tree resin; amber is predominantly polymerized diterpenoid resin, while copal is younger, incompletely polymerized resin) — gemstone

Polished amber (likely copal or amber)

Fossilized tree resin; amber is predominantly polymerized diterpenoid resin, while copal is younger, incompletely polymerized resin

Septarian nodule (likely polished) (Calcite- and/or aragonite-filled mudstone concretion; commonly Fe-bearing claystone/mudstone matrix) — sedimentary

Septarian nodule (likely polished)

Calcite- and/or aragonite-filled mudstone concretion; commonly Fe-bearing claystone/mudstone matrix

Ironstone Concretion (Boxwork) (Siderite-Limonite Concretion (FeO(OH)·nH2O)) — sedimentary

Ironstone Concretion (Boxwork)

Siderite-Limonite Concretion (FeO(OH)·nH2O)

Chert Nodule (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Nodule

Microcrystalline Quartz (SiO2)

Unidentified Dark Mineral or Rock (Indeterminate (Likely Silicon Dioxide or Carbon-based)) — mineral

Unidentified Dark Mineral or Rock

Indeterminate (Likely Silicon Dioxide or Carbon-based)

Polished green moss agate cabochon (Moss agate: microcrystalline quartz (SiO₂) with included chlorite/actinolite or iron-manganese minerals) — mineral

Polished green moss agate cabochon

Moss agate: microcrystalline quartz (SiO₂) with included chlorite/actinolite or iron-manganese minerals