Rock Identifier

Category

Organic (Paper And Cellulose)

Browse organic (paper and cellulose) specimens identified by the Rock Identifier community.

Learn about Organic (Paper And Cellulose) in the encyclopedia

Andesine

Andesite

Andalusite

Andamooka Opal

Andradite Garnet

Andradite Garnet

Andesine-Labradorite

Andesine-Labradorite

Sapropel

Bituminous Shale

Bituminous Shale

Black Shale

Petrified Wood

Amber

Oil Shale

Pearl (Calcium carbonate (CaCO3) in the form of aragonite and calcite) — gemstone

Pearl

Calcium carbonate (CaCO3) in the form of aragonite and calcite

Fossilized Shark Tooth (Selachimorpha fossil) — fossil

Fossilized Shark Tooth

Selachimorpha fossil

Pearl (Calcium carbonate with conchiolin (CaCO3)) — gemstone

Pearl

Calcium carbonate with conchiolin (CaCO3)

Red Coral (Corallium rubrum) — gemstone

Red Coral

Corallium rubrum

Likely bituminous coal (Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image) — sedimentary

Likely bituminous coal

Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image

Polished black stone egg, probably black obsidian (Obsidian, a natural volcanic glass; composition primarily silica-rich glass (approximately SiO₂), with variable iron and other trace elements) — gemstone

Polished black stone egg, probably black obsidian

Obsidian, a natural volcanic glass; composition primarily silica-rich glass (approximately SiO₂), with variable iron and other trace elements

Pearl (Calcium Carbonate (Aragonite/Calcite) and Conchiolin) — gemstone

Pearl

Calcium Carbonate (Aragonite/Calcite) and Conchiolin

Limestone Nodules or Chert (Sedimentary rock fragment) — sedimentary

Limestone Nodules or Chert

Sedimentary rock fragment

Black Onyx and Mother of Pearl (Cryptocrystalline Quartz (SiO2) and Nacre (Calcium Carbonate)) — mineral

Black Onyx and Mother of Pearl

Cryptocrystalline Quartz (SiO2) and Nacre (Calcium Carbonate)

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

Fossilized Bone in Matrix (Vertebrata fossil) — fossil

Fossilized Bone in Matrix

Vertebrata fossil

Pink Coral (Corallium rubrum (organic gemstone)) — gemstone

Pink Coral

Corallium rubrum (organic gemstone)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Fossiliferous Limestone (Fossiliferous Limestone) — sedimentary

Fossiliferous Limestone

Fossiliferous Limestone

Red Coral and Shell (Corallium rubrum and Conus/Mollusk shell) — fossil

Red Coral and Shell

Corallium rubrum and Conus/Mollusk shell

Jasper (Cryptocrystalline quartz, SiO2) — sedimentary

Jasper

Cryptocrystalline quartz, SiO2

Precious Coral (Corallium rubrum) — gemstone

Precious Coral

Corallium rubrum

Fossilized Shell (Invertebrate fossil (phylum Mollusca)) — fossil

Fossilized Shell

Invertebrate fossil (phylum Mollusca)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Amber (Succinates (Fossilized Resin)) — mineral

Amber

Succinates (Fossilized Resin)

Clay Concretion / Mudstone Nodule (Sedimentary Concretion (Argillaceous)) — sedimentary

Clay Concretion / Mudstone Nodule

Sedimentary Concretion (Argillaceous)

Fossilized Shell Fragment (Invertebrate marine fossil, likely calcium carbonate replacement) — fossil

Fossilized Shell Fragment

Invertebrate marine fossil, likely calcium carbonate replacement

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

Shale or Slate

Shale (Sedimentary) or Slate (Metamorphic)

sedimentary or metamorphic

Pearl and Garnet Glass (Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass) — mineral and glass

Pearl and Garnet Glass

Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass

mineral and glass

Turquoise and Red Coral (CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Corallium rubrum (Red Coral)) — mineral

Turquoise and Red Coral

CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Corallium rubrum (Red Coral)

Red Coral (Corallium rubrum) — gemstone

Red Coral

Corallium rubrum

Fossilized Shark Tooth (Chondrichthyes tooth) — fossil

Fossilized Shark Tooth

Chondrichthyes tooth

Weathered Sedimentary Rock (Sedimentary Rock) — Sedimentary

Weathered Sedimentary Rock

Sedimentary Rock

Shark Tooth Fossil (Chondrichthyes tooth) — fossil

Shark Tooth Fossil

Chondrichthyes tooth

Petrified Wood (Silicified wood (Silicon dioxide, SiO2)) — sedimentary

Petrified Wood

Silicified wood (Silicon dioxide, SiO2)

Soil Aggregates (Pedological aggregates (Unconsolidated regolith)) — sedimentary

Soil Aggregates

Pedological aggregates (Unconsolidated regolith)

Red Coral (Corallium rubrum) — gemstone

Red Coral

Corallium rubrum

Mother of Pearl (Nacre) — gemstone

Mother of Pearl

Nacre

Red Coral (Corallium rubrum) — gemstone

Red Coral

Corallium rubrum

Pink coral and green-stone jewelry (Likely pink coral (calcium carbonate, CaCO₃) set with an unidentified green stone; the image is too indistinct to identify the green material reliably.) — gemstone

Pink coral and green-stone jewelry

Likely pink coral (calcium carbonate, CaCO₃) set with an unidentified green stone; the image is too indistinct to identify the green material reliably.

Pearl (Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3) — gemstone

Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3

Pearl necklace (Pearl, primarily aragonite (CaCO₃) and conchiolin) — gemstone

Pearl necklace

Pearl, primarily aragonite (CaCO₃) and conchiolin

Fossilized Wood (Petrified Wood (Silicified Wood)) — fossil

Fossilized Wood

Petrified Wood (Silicified Wood)

Petrified Wood (Silicified wood (SiO2)) — fossil

Petrified Wood

Silicified wood (SiO2)

Talc (Talc (Mg₃Si₄O₁₀(OH)₂)) — Mineral

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Clam Fossil (Bivalvia fossil) — fossil

Clam Fossil

Bivalvia fossil

Ambergris (Ambrein secretion) — fossil

Ambergris

Ambrein secretion