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

Honey calcite (optical calcite) (Calcite, calcium carbonate (CaCO₃)) — mineral

Honey calcite (optical calcite)

Calcite, calcium carbonate (CaCO₃)

White Marble (Recrystallized Calcite Rock (CaCO3)) — metamorphic

White Marble

Recrystallized Calcite Rock (CaCO3)

Limestone (Calcium carbonate (CaCO3)) — sedimentary

Limestone

Calcium carbonate (CaCO3)

Barite (Barium sulfate (BaSO4)) — mineral

Barite

Barium sulfate (BaSO4)

Shungite (Carbonaceous rock (primarily amorphous carbon)) — Mineraloid

Shungite

Carbonaceous rock (primarily amorphous carbon)

Chalk (Calcium Carbonate (CaCO3)) — sedimentary

Chalk

Calcium Carbonate (CaCO3)

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

Graphite

Graphite (Native Carbon, C)

White calcite fragment (likely limestone or marble) (Calcite, calcium carbonate (CaCO₃); exact host rock is uncertain from the image) — mineral

White calcite fragment (likely limestone or marble)

Calcite, calcium carbonate (CaCO₃); exact host rock is uncertain from the image

Marble (White) (Metamorphosed Limestone (mainly CaCO3)) — metamorphic

Marble (White)

Metamorphosed Limestone (mainly CaCO3)

Selenite (Gypsum) (Hydrous calcium sulfate (CaSO4·2H2O)) — mineral

Selenite (Gypsum)

Hydrous calcium sulfate (CaSO4·2H2O)

Chalk (Calcium Carbonate (CaCO3)) — sedimentary

Chalk

Calcium Carbonate (CaCO3)

Graphite-bearing quartz-mica schist (Graphite-rich quartz–mica schist; primarily quartz (SiO₂), muscovite/biotite, and graphite (C)) — metamorphic

Graphite-bearing quartz-mica schist

Graphite-rich quartz–mica schist; primarily quartz (SiO₂), muscovite/biotite, and graphite (C)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

White Marble (Recrystallized Calcite (CaCO3)) — metamorphic

White Marble

Recrystallized Calcite (CaCO3)

Probable amber fragment (Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)) — gemstone

Probable amber fragment

Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)

Chalk (Calcium Carbonate (CaCO3)) — sedimentary

Chalk

Calcium Carbonate (CaCO3)

Slate (Slate (Metamorphic Rock)) — metamorphic

Slate

Slate (Metamorphic Rock)

Marble (Recrystallized Calcite (CaCO3)) — metamorphic

Marble

Recrystallized Calcite (CaCO3)

Marble (Recrystallized Carbonate Rock (CaCO3)) — metamorphic

Marble

Recrystallized Carbonate Rock (CaCO3)

Likely graphite-rich schist (Graphitic schist; chiefly graphite and quartz/mica) — metamorphic

Likely graphite-rich schist

Graphitic schist; chiefly graphite and quartz/mica

Marble (Recrystallized Calcite Rock (CaCO3)) — metamorphic

Marble

Recrystallized Calcite Rock (CaCO3)

Marble (Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)) — metamorphic

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

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

Chalk (Limestone variant)

Calcium Carbonate (CaCO3)

Selenite (Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O) — mineral

Selenite

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Satin Spar (Selenite) (Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O) — mineral

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

White Marble (Industrial/Architectural) (Recrystallized Calcite (CaCO3)) — metamorphic

White Marble (Industrial/Architectural)

Recrystallized Calcite (CaCO3)

Selenite (Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)) — mineral

Selenite

Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)

Marble (Recrystallized Calcite (CaCO3)) — metamorphic

Marble

Recrystallized Calcite (CaCO3)

Chalk (Sedimentary Limestone) (Calcium Carbonate (CaCO3) - Bioclastic Limestone) — sedimentary

Chalk (Sedimentary Limestone)

Calcium Carbonate (CaCO3) - Bioclastic Limestone

Crushed Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Crushed Limestone

Calcium Carbonate (CaCO3)

Barite (Barium Sulfate (BaSO4)) — mineral

Barite

Barium Sulfate (BaSO4)

Baryte (Barite) (Barium sulfate (BaSO4)) — mineral

Baryte (Barite)

Barium sulfate (BaSO4)

Barite (Barium Sulfate (BaSO4)) — mineral

Barite

Barium Sulfate (BaSO4)

White Marble (Calcite-rich Metasomatized Carbonate (CaCO3)) — metamorphic

White Marble

Calcite-rich Metasomatized Carbonate (CaCO3)

Chalk / Sedimentary Limestone (Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock) — sedimentary

Chalk / Sedimentary Limestone

Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock

Likely graphite-rich schist (graphitic schist) (Graphitic schist; chiefly quartz, mica, and graphite (carbon), with possible pyrite or feldspar) — metamorphic

Likely graphite-rich schist (graphitic schist)

Graphitic schist; chiefly quartz, mica, and graphite (carbon), with possible pyrite or feldspar

Yellow calcite (tumbled honey or lemon calcite) (Calcite, calcium carbonate (CaCO₃), likely a yellow/orange calcite variety) — mineral

Yellow calcite (tumbled honey or lemon calcite)

Calcite, calcium carbonate (CaCO₃), likely a yellow/orange calcite variety

Calcite (Calcite (CaCO₃)) — Mineral

Calcite

Calcite (CaCO₃)

Calcite (Calcite (CaCO
3)) — Mineral

Calcite

Calcite (CaCO 3)

Calcite (Calcite (Mineral; CaCO₃)) — Mineral

Calcite

Calcite (Mineral; CaCO₃)

Crushed Limestone (Limestone (CaCO3)) — sedimentary

Crushed Limestone

Limestone (CaCO3)

Purple Agate (Dyed Chalcedony) (SiO2 (Silicon Dioxide) with organic dyes) — mineral

Purple Agate (Dyed Chalcedony)

SiO2 (Silicon Dioxide) with organic dyes