Rock Identifier

Category

Organic (Biological Organism)

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

Learn about Organic (Biological Organism) in the encyclopedia

Sapropel

Bituminous Shale

Bituminous Shale

Black Shale

Petrified Wood

Amber

Jet

Oil Shale

Peat

Pearl

Lizard Skin Jasper

Coral Rock

Opalized Wood

Amber (Fossilized tree resin; primarily polymerized terpenoid resin (succinite)) — gemstone

Amber

Fossilized tree resin; primarily polymerized terpenoid resin (succinite)

Dendritic Opal (Common Opal) (Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions) — mineral

Dendritic Opal (Common Opal)

Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions

Glauconitic Sandstone (Greensand) (Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)) — sedimentary

Glauconitic Sandstone (Greensand)

Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Shale or Slate (Shale (Sedimentary) or Slate (Metamorphic)) — sedimentary or metamorphic

Shale or Slate

Shale (Sedimentary) or Slate (Metamorphic)

sedimentary or metamorphic

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

Limestone with Lichen/Moss (Calcium Carbonate (CaCO3)) — sedimentary

Limestone with Lichen/Moss

Calcium Carbonate (CaCO3)

Fossiliferous Limestone with Coral Imprint (Fossiliferous Limestone (CaCO3)) — sedimentary

Fossiliferous Limestone with Coral Imprint

Fossiliferous Limestone (CaCO3)

Fossilized Plant or Tree Bark (Lepidodendron or Sigillaria (example genera)) — sedimentary

Fossilized Plant or Tree Bark

Lepidodendron or Sigillaria (example genera)

Limestone (River or Sea Cobble) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (River or Sea Cobble)

Calcium Carbonate (CaCO3)

Sandstone (River Cobble) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2)

Palm Wood Fossil (Palmoxylon) — fossil

Palm Wood Fossil

Palmoxylon

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

Petrified Wood (Silicified Fossil)

Silicified Wood (SiO2)

Petrified wood (Silicified fossil wood, commonly quartz/chalcedony (SiO₂) replacing woody tissue) — fossil

Petrified wood

Silicified fossil wood, commonly quartz/chalcedony (SiO₂) replacing woody tissue

Pearl (Nacre (aragonite, CaCO₃, in an organic conchiolin matrix)) — gemstone

Pearl

Nacre (aragonite, CaCO₃, in an organic conchiolin matrix)

Fancy Jasper (Silicon Dioxide (SiO2) with iron and organic inclusions) — sedimentary

Fancy Jasper

Silicon Dioxide (SiO2) with iron and organic inclusions

Amber (Succinite (organic mineraloid); Chemical formula: C10H16O) — mineral

Amber

Succinite (organic mineraloid); Chemical formula: C10H16O

Banded Calcite (Zebra Calcite) (Calcite (CaCO3) with trace organic or oxide inclusions) — sedimentary

Banded Calcite (Zebra Calcite)

Calcite (CaCO3) with trace organic or oxide inclusions

Coal (Bituminous coal (Complex organic sedimentary rock)) — sedimentary

Coal

Bituminous coal (Complex organic sedimentary rock)

Amber (Organic gemstone (Succinite is common if from the Baltic)) — mineral

Amber

Organic gemstone (Succinite is common if from the Baltic)

Amber (Cherry or Red variety) (Succinite (with various trace amounts of organic compounds)) — Organic Gemstone (not a rock)

Amber (Cherry or Red variety)

Succinite (with various trace amounts of organic compounds)

Organic Gemstone (not a rock)

Bituminous Coal (Organic-rich sedimentary rock (Complex hydrocarbons)) — sedimentary

Bituminous Coal

Organic-rich sedimentary rock (Complex hydrocarbons)

Pearl (Organic gemstone (Calcium carbonate / CaCO3 + Conchiolin)) — mineral

Pearl

Organic gemstone (Calcium carbonate / CaCO3 + Conchiolin)

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)

Red Amber (Burmite/Cherry Amber) (Succinite / Retinite (Organic Fossilized Resin, C10H16O)) — Mineraloid (Organic)

Red Amber (Burmite/Cherry Amber)

Succinite / Retinite (Organic Fossilized Resin, C10H16O)

Mineraloid (Organic)

Fossil bivalve shell (Ribbed pectinid or related bivalve; originally calcite/aragonite (CaCO₃), likely partially mineralized) — fossil

Fossil bivalve shell

Ribbed pectinid or related bivalve; originally calcite/aragonite (CaCO₃), likely partially mineralized

Petrified Wood (Silicified wood (Quartz/Chalcedony replacement of Cellulose)) — fossil

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of Cellulose)

Petrified Wood (Silicified Wood (primarily SiO2)) — fossil

Petrified Wood

Silicified Wood (primarily SiO2)

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

Chert (Chalcedony)

Cryptocrystalline Quartz (SiO2)

Petrified Wood Fragment (Silicified Wood (SiO2)) — fossil

Petrified Wood Fragment

Silicified Wood (SiO2)

Fossiliferous Limestone (Bioclastic Limestone (composition: CaCO3)) — sedimentary

Fossiliferous Limestone

Bioclastic Limestone (composition: CaCO3)

Hag Stone (Perforated Sedimentary Rock (primarily Siltstone or Mudstone)) — sedimentary

Hag Stone

Perforated Sedimentary Rock (primarily Siltstone or Mudstone)

Petrified Wood (Silicified Wood (SiO2)) — mineral

Petrified Wood

Silicified Wood (SiO2)

Fossilized Shell in Limestone (Bivalve fossil (CaCO3) in Carbonate Sedimentary Rock) — sedimentary

Fossilized Shell in Limestone

Bivalve fossil (CaCO3) in Carbonate Sedimentary Rock

Amber (Succinite) — mineral

Amber

Succinite

Red Coral (with Hematite and Black Pearl accents) (Corallium rubrum (Calcium Carbonate, CaCO3)) — mineral

Red Coral (with Hematite and Black Pearl accents)

Corallium rubrum (Calcium Carbonate, CaCO3)

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)

Coal (Anthracite / Bituminous Coal) — sedimentary

Coal

Anthracite / Bituminous Coal

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