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

Pink Opal (Hydrated Silica (SiO2·nH2O)) — mineral

Pink Opal

Hydrated Silica (SiO2·nH2O)

Amber (Succinite (fossilized tree resin)) — mineral

Amber

Succinite (fossilized tree resin)

River Cobble (Sandstone) (Arenite (primarily SiO2)) — sedimentary

River Cobble (Sandstone)

Arenite (primarily SiO2)

Moss Agate (Silicon Dioxide (SiO2) with mineral inclusions of hornblende or chlorite) — Mineral (variety of Chalcedony)

Moss Agate

Silicon Dioxide (SiO2) with mineral inclusions of hornblende or chlorite

Mineral (variety of Chalcedony)

Shale (with minor calcite veining) (Clastic sedimentary rock (primarily clay minerals and quartz)) — sedimentary

Shale (with minor calcite veining)

Clastic sedimentary rock (primarily clay minerals and quartz)

Amber (Succinite (fossilized resin); C10H16O) — mineraloid

Amber

Succinite (fossilized resin); C10H16O

Moss Agate with Quartz Druzy (Chalcedony with inclusions (SiO2)) — mineral

Moss Agate with Quartz Druzy

Chalcedony with inclusions (SiO2)

Liesegang Ring Siltstone (Siltstone with iron oxide Liesegang bands) — sedimentary

Liesegang Ring Siltstone

Siltstone with iron oxide Liesegang bands

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

Moss Agate

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

Amber (Succinite (C10H16O)) — mineraloid

Amber

Succinite (C10H16O)

Petrified wood (Silicified wood, chiefly microcrystalline quartz (SiO₂)) — fossil

Petrified wood

Silicified wood, chiefly microcrystalline quartz (SiO₂)

Amber with Fossil Inclusion (Fossilized Tree Resin (Succinite)) — fossil

Amber with Fossil Inclusion

Fossilized Tree Resin (Succinite)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Blue Aragonite (Aragonite (Calcium Carbonate, CaCO3)) — mineral

Blue Aragonite

Aragonite (Calcium Carbonate, CaCO3)

Shale (Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)) — sedimentary

Shale

Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)

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

Dendritic Agate / Moss Agate

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

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

Green Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite

Precious Coral (Corallium rubrum (Calcium Carbonate, CaCO3)) — mineral

Precious Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

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

Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite

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

Moss Agate

Chalcedony (Silicon Dioxide, SiO2) with dendritic inclusions

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

Petrified Wood

Silicified Wood (primarily SiO2)

Shale (Clastic sedimentary rock (primarily clay and silt minerals)) — sedimentary

Shale

Clastic sedimentary rock (primarily clay and silt minerals)

Chert (containing small fossils) (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert (containing small fossils)

Chert (Microcrystalline Quartz, SiO2)

Petrified Wood (Silicified Wood (primarily quartz/chalcedony replacing organic wood structures, SiO2)) — fossil

Petrified Wood

Silicified Wood (primarily quartz/chalcedony replacing organic wood structures, SiO2)

Moss agate bracelet (Chalcedony (microcrystalline quartz, SiO₂) with chlorite/amphibole inclusions) — gemstone

Moss agate bracelet

Chalcedony (microcrystalline quartz, SiO₂) with chlorite/amphibole inclusions

Fossil gastropod shell (Fossilized marine gastropod; exact genus/species requires locality and examination) — fossil

Fossil gastropod shell

Fossilized marine gastropod; exact genus/species requires locality and examination

Chert Nodule in Limestone (Flint in Chalk) (SiO2 (Microcrystalline Quartz) in CaCO3 (Calcite)) — sedimentary

Chert Nodule in Limestone (Flint in Chalk)

SiO2 (Microcrystalline Quartz) in CaCO3 (Calcite)

Kambaba Jasper (Crocodile Jasper) (Stromatolite Fossil (Silicified Stromatolite / Quartz with Microfossils)) — fossil

Kambaba Jasper (Crocodile Jasper)

Stromatolite Fossil (Silicified Stromatolite / Quartz with Microfossils)

Amber (Fossilized Tree Resin (C10H16O)) — gemstone

Amber

Fossilized Tree Resin (C10H16O)

Banded Agate (Dyed) (SiO2 (Silicon Dioxide / Microcrystalline Quartz)) — mineral

Banded Agate (Dyed)

SiO2 (Silicon Dioxide / Microcrystalline Quartz)

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

Moss Agate

Silicon Dioxide (SiO2) with inclusions

Pink Opal (Hydrated Silica (SiO2·nH2O) with Palygorskite/Sepiolite inclusions) — gemstone

Pink Opal

Hydrated Silica (SiO2·nH2O) with Palygorskite/Sepiolite inclusions

Black Dolomite (Bituminous Dolomite (CaMg(CO3)2)) — sedimentary

Black Dolomite

Bituminous Dolomite (CaMg(CO3)2)

Petrified Wood (Silicified Wood (SiO2)) — metamorphic

Petrified Wood

Silicified Wood (SiO2)

Shale with Siltstone layering (Sedimentary Clastic Rock (Mudstone/Shale)) — sedimentary

Shale with Siltstone layering

Sedimentary Clastic Rock (Mudstone/Shale)

Tufa (Limestone) (Calcareous Tufa (CaCO3)) — sedimentary

Tufa (Limestone)

Calcareous Tufa (CaCO3)

Moss Agate (Chalcedony (SiO2) with inclusions of manganese or iron oxides) — mineral

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxides

Gastropod Steinkern (Fossil Snail Internal Mold) (Class Gastropoda (Internal Mold)) — sedimentary

Gastropod Steinkern (Fossil Snail Internal Mold)

Class Gastropoda (Internal Mold)

Moss Agate (Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)) — Mineral

Moss Agate

Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)

Fossilized Favosites (Honeycomb Coral) (Favosites (Genus), Phylum Cnidaria, Class Anthozoa) — sedimentary

Fossilized Favosites (Honeycomb Coral)

Favosites (Genus), Phylum Cnidaria, Class Anthozoa

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

Limestone (River Pebble)

Sedimentary Calcium Carbonate (CaCO3)

Amber Inlay Jewelry (Fossilized Resin (C10H16O)) — Organic Gemstone (Biogenic)

Amber Inlay Jewelry

Fossilized Resin (C10H16O)

Organic Gemstone (Biogenic)