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

Peat

Oil Shale

Pearl

Lizard Skin Jasper

Coral Rock

Opalized Wood

Amber (Succinited (C10H16O)) — fossil

Amber

Succinited (C10H16O)

Chert / Fossiliferous Limestone (Sedimentary Chert (often containing CaCO3 or SiO2 replacements)) — sedimentary

Chert / Fossiliferous Limestone

Sedimentary Chert (often containing CaCO3 or SiO2 replacements)

Limestone with Chert (Calcium Carbonate (CaCO3) with Silica (SiO2) inclusions) — sedimentary

Limestone with Chert

Calcium Carbonate (CaCO3) with Silica (SiO2) inclusions

Travertine (Calcareous tufa (CaCO3)) — sedimentary

Travertine

Calcareous tufa (CaCO3)

Fossilized Brachiopod (Brachiopoda (likely Order Spiriferida or Productida)) — fossil

Fossilized Brachiopod

Brachiopoda (likely Order Spiriferida or Productida)

River Rock (Silica-rich water-worn rock) — sedimentary

River Rock

Silica-rich water-worn rock

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Amber (Succinite / Fossilized Resin (C10H16O)) — fossil

Amber

Succinite / Fossilized Resin (C10H16O)

Tumbled amber-like inclusion (Likely amber (fossilized tree resin; complex polymer), but identification is uncertain from the image) — gemstone

Tumbled amber-like inclusion

Likely amber (fossilized tree resin; complex polymer), but identification is uncertain from the image

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

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

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

Amber (Fossilized Tree Resin) — gemstone

Amber

Fossilized Tree Resin

Fluorite (Fluorite (CaF2)) — mineral

Fluorite

Fluorite (CaF2)

Amber (Fossilized tree resin) — gemstone

Amber

Fossilized tree resin

Fossilized Coral (Cnidaria fossil / Calcite-replaced coral) — fossil

Fossilized Coral

Cnidaria fossil / Calcite-replaced coral

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)

Gastropod Fossil (Phylum Mollusca, Class Gastropoda) — fossil

Gastropod Fossil

Phylum Mollusca, Class Gastropoda

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

Ironstone Concretion (Boxwork)

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

Limestone (Calcareous sedimentary rock (primarily CaCO3)) — sedimentary

Limestone

Calcareous sedimentary rock (primarily CaCO3)

Amber (Succinite (fossilized tree resin)) — mineral

Amber

Succinite (fossilized tree resin)

Amber (Succinate (Succinite for Baltic varieties)) — mineraloid

Amber

Succinate (Succinite for Baltic varieties)

Amber (Succinite (fossilized resin)) — mineral

Amber

Succinite (fossilized resin)

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

Chert (Flint)

Silicon dioxide (SiO2)

Limestone (River Stone) (Calcite-rich Sedimentary Rock (CaCO3)) — sedimentary

Limestone (River Stone)

Calcite-rich Sedimentary Rock (CaCO3)

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

Moss Agate

Silicon Dioxide with inclusions (SiO2 + Mn/Fe/Chlorite)

Amber (Succinite (Resin)) — mineral

Amber

Succinite (Resin)

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

Fossilized Solitary Rugose Coral

Order Rugosa (commonly Horn Coral)

Amber (Succinates (Fossilized Resin)) — mineral

Amber

Succinates (Fossilized Resin)

Amber (Succinite (approximate formula C10H16O)) — mineral

Amber

Succinite (approximate formula C10H16O)

Chert (containing a small fossil) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (containing a small fossil)

Microcrystalline Quartz (SiO2)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Fossiliferous Limestone (Calcium carbonate (CaCO3) with marine fossils) — sedimentary

Fossiliferous Limestone

Calcium carbonate (CaCO3) with marine fossils

Amber (Succinite (C10H16O)) — mineral

Amber

Succinite (C10H16O)

Amber (Succinite (approximate formula C10H16O)) — mineral

Amber

Succinite (approximate formula C10H16O)

Amber (Succiniferous fossil resin (C10H16O)) — mineraloid

Amber

Succiniferous fossil resin (C10H16O)

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

Petrified Wood

Silicified Wood (primarily SiO2)

Pearl (Nacre (Aragonite and Conchiolin), CaCO3) — mineral

Pearl

Nacre (Aragonite and Conchiolin), CaCO3

Agate (Moss or Dendritic Agate) (Chalcedony (Silicon Dioxide, SiO2)) — mineral

Agate (Moss or Dendritic Agate)

Chalcedony (Silicon Dioxide, SiO2)

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

Flint (chert), likely brown flint

Microcrystalline quartz/chalcedony (SiO₂)

Limestone (Calcareous sedimentary rock (CaCO3)) — sedimentary

Limestone

Calcareous sedimentary rock (CaCO3)

Black Limestone (Bituminous Limestone (Calcium Carbonate - CaCO3)) — sedimentary

Black Limestone

Bituminous Limestone (Calcium Carbonate - CaCO3)