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

Quartzite (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Chalk (Limestone) (Calcium Carbonate (CaCO3)) — sedimentary

Chalk (Limestone)

Calcium Carbonate (CaCO3)

Sandstone (River Cobble) (Sandstone (composed predominantly of SiO2 - Quartz)) — sedimentary

Sandstone (River Cobble)

Sandstone (composed predominantly of SiO2 - Quartz)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Agate Sliced Nodule (Silicon Dioxide (SiO2)) — mineral

Agate Sliced Nodule

Silicon Dioxide (SiO2)

Orthoceras Fossil in Limestone (Orthoceras regulare (Class Cephalopoda)) — fossil

Orthoceras Fossil in Limestone

Orthoceras regulare (Class Cephalopoda)

Banded Iron Formation (Chert and Magnetite/Hematite) (Banded Iron Formation (BIF)) — sedimentary

Banded Iron Formation (Chert and Magnetite/Hematite)

Banded Iron Formation (BIF)

Fossil Coral (Favosites) (Favosites sp. (Phylum Cnidaria, Class Anthozoa)) — fossil

Fossil Coral (Favosites)

Favosites sp. (Phylum Cnidaria, Class Anthozoa)

Biotite on Quartz (Biotite Mica (K(Mg,Fe)3AlSi3O10(F,OH)2)) — mineral

Biotite on Quartz

Biotite Mica (K(Mg,Fe)3AlSi3O10(F,OH)2)

Sandstone (Sandstone (composed predominantly of Quartz, SiO2)) — sedimentary

Sandstone

Sandstone (composed predominantly of Quartz, SiO2)

Sandstone Pebble (Arenite (SiO2 with various cementing agents)) — sedimentary

Sandstone Pebble

Arenite (SiO2 with various cementing agents)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Graphite (Graphite (Native Carbon, C)) — Mineral

Graphite

Graphite (Native Carbon, C)

Petoskey Stone (Hexagonaria percarinata) — sedimentary

Petoskey Stone

Hexagonaria percarinata

Tumbled brown agate (Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions) — mineral

Tumbled brown agate

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions

Polished Septarian Nodule (Septarian calcite–aragonite concretion, commonly with barite or celestine) — sedimentary

Polished Septarian Nodule

Septarian calcite–aragonite concretion, commonly with barite or celestine

Agate Slice (Carnelian Agate) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Agate Slice (Carnelian Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Red Jasper (Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)) — sedimentary

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Granite Cobble (Granite) — igneous

Granite Cobble

Granite

Dyed Agate Geode Slice (Silicon Dioxide (SiO2) - Banded Chalcedony) — mineral

Dyed Agate Geode Slice

Silicon Dioxide (SiO2) - Banded Chalcedony

Fossilized Coral (Petoskey-style) (Hexagonaria percarinata (Fossilized Rugose Coral)) — sedimentary

Fossilized Coral (Petoskey-style)

Hexagonaria percarinata (Fossilized Rugose Coral)

Honey Calcite (Calcium Carbonate (CaCO3)) — mineral

Honey Calcite

Calcium Carbonate (CaCO3)

Chalk (Calcium Carbonate (CaCO3)) — sedimentary

Chalk

Calcium Carbonate (CaCO3)

Aragonite (Banded Calcite / 'Mexican Onyx') (Aragonite (Calcium Carbonate - CaCO3)) — mineral

Aragonite (Banded Calcite / 'Mexican Onyx')

Aragonite (Calcium Carbonate - CaCO3)

Geode with Quartz and Chalcedony (Silicon Dioxide (SiO2)) — sedimentary

Geode with Quartz and Chalcedony

Silicon Dioxide (SiO2)

Muscovite Schist with Quartz (Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz Matrix) — metamorphic

Muscovite Schist with Quartz

Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz Matrix

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Red Sandstone Pebble (Arenite (Quartz Sandstone / Hematitic Sandstone)) — sedimentary

Red Sandstone Pebble

Arenite (Quartz Sandstone / Hematitic Sandstone)

Slate (Foliated metamorphic rock) — metamorphic

Slate

Foliated metamorphic rock

Banded Agate (Silicon Dioxide (SiO2)) — mineral

Banded Agate

Silicon Dioxide (SiO2)

Slate (Slate (Foliated metamorphic rock consisting mainly of quartz and muscovite or illite)) — metamorphic

Slate

Slate (Foliated metamorphic rock consisting mainly of quartz and muscovite or illite)

Calcite (Iceland Spar) (Calcite (Calcium Carbonate, CaCO3)) — mineral

Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Slate River Stone (Foliated Metamorphic Rock (composed of illite, chlorite, and quartz)) — metamorphic

Slate River Stone

Foliated Metamorphic Rock (composed of illite, chlorite, and quartz)

Garnet in Schist (Polished Tower) (Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist) — metamorphic

Garnet in Schist (Polished Tower)

Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist

Limestone (Calcite rock (CaCO3)) — sedimentary

Limestone

Calcite rock (CaCO3)

Banded Agate (Cryptocrystalline Quartz (SiO2)) — sedimentary

Banded Agate

Cryptocrystalline Quartz (SiO2)

Pyrite (Fool's Gold) (Iron Disulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Sandstone (Pet Rock) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (Pet Rock)

Clastic sedimentary rock (primarily SiO2)

Muscovite Mica (Golden/Yellow variety) (KAl2(AlSi3O10)(F,OH)2) — mineral

Muscovite Mica (Golden/Yellow variety)

KAl2(AlSi3O10)(F,OH)2

Polished banded agate (likely sardonyx) (Cryptocrystalline chalcedony, SiO₂; reddish bands are iron-stained layers) — mineral

Polished banded agate (likely sardonyx)

Cryptocrystalline chalcedony, SiO₂; reddish bands are iron-stained layers