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) — gemstone

Pearl

Calcium carbonate (CaCO3) in the form of aragonite

Polished/tumbled quartz-rich rock, possibly quartzite (Quartzite; predominantly crystalline SiO₂, with minor iron-oxide and other impurities) — metamorphic

Polished/tumbled quartz-rich rock, possibly quartzite

Quartzite; predominantly crystalline SiO₂, with minor iron-oxide and other impurities

Agate (various color varieties) (SiO₂ (Silicon Dioxide)) — Mineral (specifically a variety of Chalcedony, which is a microcrystalline quartz)

Agate (various color varieties)

SiO₂ (Silicon Dioxide)

Mineral (specifically a variety of Chalcedony, which is a microcrystalline quartz)

Polished blue calcite sphere (tentative identification) (Calcite, CaCO₃; blue color generally results from trace impurities or inclusions) — mineral

Polished blue calcite sphere (tentative identification)

Calcite, CaCO₃; blue color generally results from trace impurities or inclusions

Polished white chalcedony or milky quartz pebble (Chalcedony, microcrystalline quartz (SiO₂), possibly with iron-oxide staining or a minor mineral inclusion) — mineral

Polished white chalcedony or milky quartz pebble

Chalcedony, microcrystalline quartz (SiO₂), possibly with iron-oxide staining or a minor mineral inclusion

Amber cabochon pendant (Amber (fossilized tree resin; chiefly polymerized terpenoids)) — gemstone

Amber cabochon pendant

Amber (fossilized tree resin; chiefly polymerized terpenoids)

Amber / Copal (Organic resin, C10H16O) — mineral

Amber / Copal

Organic resin, C10H16O

Red Coral (Corallium rubrum) — gemstone

Red Coral

Corallium rubrum

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

Seashell Fragment (Calcium carbonate (CaCO3) - primarily Aragonite or Calcite) — fossil

Seashell Fragment

Calcium carbonate (CaCO3) - primarily Aragonite or Calcite

Fossilized Shark Tooth (Selachimorpha fossil) — fossil

Fossilized Shark Tooth

Selachimorpha fossil

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

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)

Fossiliferous Limestone (Fossiliferous Limestone) — sedimentary

Fossiliferous Limestone

Fossiliferous Limestone

Amber (Succinates (Fossilized Resin)) — mineral

Amber

Succinates (Fossilized Resin)

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

Shale or Slate

Shale (Sedimentary) or Slate (Metamorphic)

sedimentary or metamorphic

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)

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

Fossilized Shell Fragment

Invertebrate marine fossil, likely calcium carbonate replacement

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

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

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Weathered Sedimentary Rock (Sedimentary Rock) — Sedimentary

Weathered Sedimentary Rock

Sedimentary Rock

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

Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3

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

Petrified Wood

Petrified Wood (Silicified Wood)

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

Pearl

Calcium Carbonate (CaCO3) - Aragonite/Calcite

Pearl (Calcium carbonate (CaCO3) in the form of Aragonite or Calcite) — mineral

Pearl

Calcium carbonate (CaCO3) in the form of Aragonite or Calcite

Fossilized Bone Fragment (Vertebrate Fossil) — fossil

Fossilized Bone Fragment

Vertebrate Fossil

Flint with Fossil Inclusion (Cryptocrystalline quartz (SiO2) enclosing fossilized organic remains) — sedimentary

Flint with Fossil Inclusion

Cryptocrystalline quartz (SiO2) enclosing fossilized organic remains

Amber (and Cubic Zirconia) (Fossilized Tree Resin) — mineraloid

Amber (and Cubic Zirconia)

Fossilized Tree Resin

Fossiliferous Limestone (Shell Fragment) (Biogenic Limestone (Calcium Carbonate / CaCO3)) — sedimentary

Fossiliferous Limestone (Shell Fragment)

Biogenic Limestone (Calcium Carbonate / CaCO3)

Moss Agate (SiO2) — mineral

Moss Agate

SiO2

Fossilized Tooth Fragment (Vertebrate Fossil (Mammalia indet.)) — fossil

Fossilized Tooth Fragment

Vertebrate Fossil (Mammalia indet.)

Fossil Shark Tooth (Chondrichthyes (Class)) — fossil

Fossil Shark Tooth

Chondrichthyes (Class)

Mother of Pearl and Onyx (Aragonite (Mother of Pearl) and Chalcedony (Onyx)) — mineral

Mother of Pearl and Onyx

Aragonite (Mother of Pearl) and Chalcedony (Onyx)

Shark Tooth Fossil (Chondrichthyes (shark) tooth) — fossil

Shark Tooth Fossil

Chondrichthyes (shark) tooth

Limestone or Sandstone Cobble (Sedimentary rock (Calcium carbonate or Quartz based)) — sedimentary

Limestone or Sandstone Cobble

Sedimentary rock (Calcium carbonate or Quartz based)

Shiva's Eye (Cat's Eye Shell) (Operculum of Turbo marmoratus) — fossil

Shiva's Eye (Cat's Eye Shell)

Operculum of Turbo marmoratus

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

Amber (Succinite (Organic Gemstone)) — mineral

Amber

Succinite (Organic Gemstone)

Shale fragment (Shale (Laminated Mudstone)) — sedimentary

Shale fragment

Shale (Laminated Mudstone)

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

Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin

Likely bituminous coal (Coal, predominantly carbon-rich organic matter with variable maceral and mineral content) — sedimentary

Likely bituminous coal

Coal, predominantly carbon-rich organic matter with variable maceral and mineral content

Amber (Fossilized Tree Resin) — gemstone

Amber

Fossilized Tree Resin