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

Chert (with Quartz vein) (Chert (Silicon Dioxide, SiO2)) — sedimentary

Chert (with Quartz vein)

Chert (Silicon Dioxide, SiO2)

Weathered iron-rich limestone or sandstone (Ferruginous carbonate/siliciclastic rock; likely calcite- and iron-oxide-bearing matrix) — sedimentary

Weathered iron-rich limestone or sandstone

Ferruginous carbonate/siliciclastic rock; likely calcite- and iron-oxide-bearing matrix

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

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

Amber

Succinite / Fossilized Resin (C10H16O)

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

River Rock

Silica-rich water-worn rock

Fossiliferous limestone (Bioclastic calcitic limestone (predominantly CaCO₃)) — sedimentary

Fossiliferous limestone

Bioclastic calcitic limestone (predominantly CaCO₃)

Chert (likely flint) (Microcrystalline quartz (SiO₂), chiefly chalcedony and quartz) — sedimentary

Chert (likely flint)

Microcrystalline quartz (SiO₂), chiefly chalcedony and quartz

Weathered iron-rich rock, likely ferruginous sandstone or lateritic concretion (Iron-oxide–cemented sandstone; commonly dominated by quartz (SiO₂), goethite (FeO(OH)) and hematite (Fe₂O₃)) — sedimentary

Weathered iron-rich rock, likely ferruginous sandstone or lateritic concretion

Iron-oxide–cemented sandstone; commonly dominated by quartz (SiO₂), goethite (FeO(OH)) and hematite (Fe₂O₃)

Graphitic schist (probable) (Graphite-bearing mica schist; chiefly quartz, mica, and graphite) — metamorphic

Graphitic schist (probable)

Graphite-bearing mica schist; chiefly quartz, mica, and graphite

Amber (Succiniferous fossil resin (C10H16O)) — gemstone

Amber

Succiniferous fossil resin (C10H16O)

Concretion (Septarian or Siderite Concretion) — sedimentary

Concretion

Septarian or Siderite Concretion

Chert Concretion (Sedimentary Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert Concretion

Sedimentary Cryptocrystalline Quartz (SiO2)

Tumbled moss agate (Chalcedony (microcrystalline quartz, SiO₂) with moss-like inclusions) — mineral

Tumbled moss agate

Chalcedony (microcrystalline quartz, SiO₂) with moss-like inclusions

Amber (Fossilized Tree Resin) — gemstone

Amber

Fossilized Tree Resin

Banded Siltstone Pebble (Siltstone (primarily SiO2, Al2O3, Fe2O3)) — sedimentary

Banded Siltstone Pebble

Siltstone (primarily SiO2, Al2O3, Fe2O3)

Desert Rose Fragment (Atypical) / Weathered Chert (Silicon Dioxide (SiO2) or Barium Sulfate (BaSO4) depending on exact mineralogy) — sedimentary

Desert Rose Fragment (Atypical) / Weathered Chert

Silicon Dioxide (SiO2) or Barium Sulfate (BaSO4) depending on exact mineralogy

Amber (Succinit (C10H16O)) — mineraloid

Amber

Succinit (C10H16O)

Fossilized Bivalve Shell (Bivalvia (fossil specimen)) — sedimentary

Fossilized Bivalve Shell

Bivalvia (fossil specimen)

Amber (Succinite (Resinite), C10-H16-O) — mineral

Amber

Succinite (Resinite), C10-H16-O

Amber (Succinite) — Organic Gemstone (sedimentary associations)

Amber

Succinite

Organic Gemstone (sedimentary associations)

Natural White Pearl (Calcium Carbonate (Aragonite/Calcite) with Conchiolin - CaCO3) — mineraloid

Natural White Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin - CaCO3

Fossiliferous Limestone Pebble (Calcium Carbonate (CaCO3) with Biogenic Inclusions) — sedimentary

Fossiliferous Limestone Pebble

Calcium Carbonate (CaCO3) with Biogenic Inclusions

Barnacle-encrusted basalt or volcanic cobble (Likely basalt (plagioclase–pyroxene–olivine), coated by marine carbonate encrustation) — igneous

Barnacle-encrusted basalt or volcanic cobble

Likely basalt (plagioclase–pyroxene–olivine), coated by marine carbonate encrustation

Petoskey Stone (Hexagonaria percarinata (Fossilized Rugose Coral)) — sedimentary

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Fossiliferous Jasper / Miriam Stone / Elephant Skin Jasper (Biogenic Chalcedony / Silicified Fossiliferous Limestone) — fossil

Fossiliferous Jasper / Miriam Stone / Elephant Skin Jasper

Biogenic Chalcedony / Silicified Fossiliferous Limestone

Moss agate (likely dendritic/chalcedony slab) (Cryptocrystalline quartz, SiO₂, with green amphibole or chlorite inclusions) — mineral

Moss agate (likely dendritic/chalcedony slab)

Cryptocrystalline quartz, SiO₂, with green amphibole or chlorite inclusions

Polished amber-like chalcedony/jasper (Microcrystalline quartz (SiO₂), likely iron-stained chalcedony or jasper; amber cannot be confirmed visually) — mineral

Polished amber-like chalcedony/jasper

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony or jasper; amber cannot be confirmed visually

Fossilized gastropod (likely nerite or related sea snail) (Gastropoda; shell composed originally of aragonite/calcite, commonly replaced or infilled by calcite) — fossil

Fossilized gastropod (likely nerite or related sea snail)

Gastropoda; shell composed originally of aragonite/calcite, commonly replaced or infilled by calcite

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

Black Limestone

Bituminous Limestone (Calcium Carbonate - CaCO3)

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

Moss Agate

Chalcedony (SiO2 with inclusions)

Amber (Succinite (Fossilized Resin)) — gemstone

Amber

Succinite (Fossilized Resin)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Pearl (Calcium Carbonate (Aragonite) - CaCO3) — mineral

Pearl

Calcium Carbonate (Aragonite) - CaCO3

Amber (Succinite (Resin C10H16O)) — mineral

Amber

Succinite (Resin C10H16O)

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)

Zebra Rock / Zebra Marble (Banded Limestone-Marble Transition) — metamorphic

Zebra Rock / Zebra Marble

Banded Limestone-Marble Transition

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Amber (Succinite (Fossilized Tree Resin)) — mineraloid

Amber

Succinite (Fossilized Tree Resin)

Brain Coral Fossil (Family Mussidae or Merulinidae (Order Scleractinia)) — sedimentary

Brain Coral Fossil

Family Mussidae or Merulinidae (Order Scleractinia)

Amber (Succinite (fossilized tree resin)) — mineraloid

Amber

Succinite (fossilized tree resin)

Amber (Succinite) — Organic Mineral

Amber

Succinite

Organic Mineral