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

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Fossil Coral (Rugosa or Solitary Coral) (Rugosa (Order), often referred to as 'Horn Coral' (Lithostrotionella or Grewingkia)) — sedimentary

Fossil Coral (Rugosa or Solitary Coral)

Rugosa (Order), often referred to as 'Horn Coral' (Lithostrotionella or Grewingkia)

Painted River Rock (Painted Quartzite or Smooth Siltstone) — sedimentary

Painted River Rock

Painted Quartzite or Smooth Siltstone

Petrified Wood (Agatized/Silicified Wood) (Silicified Wood (SiO2 - Silicon Dioxide)) — metamorphic

Petrified Wood (Agatized/Silicified Wood)

Silicified Wood (SiO2 - Silicon Dioxide)

Inspirational River Stone (Quartzite) (Metamorphosed Quartz-rich Rock (Quartzite) with SiO2 composition) — metamorphic

Inspirational River Stone (Quartzite)

Metamorphosed Quartz-rich Rock (Quartzite) with SiO2 composition

Ceramic or Polished Stone Heart (Anthropogenic Material) (Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)) — Synthetic/Anthropogenic Mineraloid

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Synthetic/Anthropogenic Mineraloid

Petoskey Stone (Hexagonaria percarinata) — fossil

Petoskey Stone

Hexagonaria percarinata

Dyed Agate Geode Slice (Silicon Dioxide (SiO2)) — mineral

Dyed Agate Geode Slice

Silicon Dioxide (SiO2)

Petoskey Stone (Hexagonaria percarinata (Silicified/Calcitic)) — fossil

Petoskey Stone

Hexagonaria percarinata (Silicified/Calcitic)

Painted Pet Rock (Quartzite/Sandstone base) (Silicon Dioxide (SiO2) with anthropomorphic acrylic embellishments) — sedimentary

Painted Pet Rock (Quartzite/Sandstone base)

Silicon Dioxide (SiO2) with anthropomorphic acrylic embellishments

Painted River Rock (Polished fluvial clast with acrylic/synthetic pigment coating) — Sedimentary or Metamorphic (base substrate)

Painted River Rock

Polished fluvial clast with acrylic/synthetic pigment coating

Sedimentary or Metamorphic (base substrate)

Painted Garden Rock (likely Granite or Limestone base) (Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments) — igneous or sedimentary (anthropogenic modification)

Painted Garden Rock (likely Granite or Limestone base)

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments

igneous or sedimentary (anthropogenic modification)

Biotite (Black Mica) (Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)) — mineral

Biotite (Black Mica)

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

Kaolin (China Clay) (Kaolinite [Al2Si2O5(OH)4]) — sedimentary

Kaolin (China Clay)

Kaolinite [Al2Si2O5(OH)4]

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

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Amethyst (Resin Carving/Orgonite) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst (Resin Carving/Orgonite)

Silicon Dioxide (SiO2) with iron impurities

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

Dyed Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Petoskey Stone (Hexagonaria percarinata) — sedimentary

Petoskey Stone

Hexagonaria percarinata

Sandstone with Quartz/Calcite druse (Arenite with druse (SiO2 or CaCO3)) — sedimentary

Sandstone with Quartz/Calcite druse

Arenite with druse (SiO2 or CaCO3)

Sandstone (Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Thunder Egg (Agate Core) (Cryptocrystalline Quartz (SiO2) in Rhyolite/Perlite Matrix) — mineral

Thunder Egg (Agate Core)

Cryptocrystalline Quartz (SiO2) in Rhyolite/Perlite Matrix

Kaolinite (China Clay / Chalky Claystone) (Al2Si2O5(OH)4) — mineral

Kaolinite (China Clay / Chalky Claystone)

Al2Si2O5(OH)4

Fossilized Coral (Petoskey Stone type) (Hexagonaria percarinata (Fossilized Rugose Coral)) — fossil

Fossilized Coral (Petoskey Stone type)

Hexagonaria percarinata (Fossilized Rugose Coral)

Slate (Slate) — metamorphic

Slate

Slate

Mica (Biotite or Phlogopite Buchsam) (Silicate Mineral (Phyllosilicate family)) — mineral

Mica (Biotite or Phlogopite Buchsam)

Silicate Mineral (Phyllosilicate family)

Molybdenite in Quartz (Molybdenite (MoS2) with Quartz (SiO2)) — mineral

Molybdenite in Quartz

Molybdenite (MoS2) with Quartz (SiO2)

Tumbled milky quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Fossilized Coral (Petoskey Stone type) (Hexagonaria percarinata (Order: Rugosa)) — sedimentary

Fossilized Coral (Petoskey Stone type)

Hexagonaria percarinata (Order: Rugosa)

White Marble (Recrystallized Calcite (CaCO3)) — metamorphic

White Marble

Recrystallized Calcite (CaCO3)

Banded Iron Formation (Banded Iron Formation (BIF)) — sedimentary

Banded Iron Formation

Banded Iron Formation (BIF)

Sandstone (Arenite (primarily Quartz chemical formula SiO2)) — sedimentary

Sandstone

Arenite (primarily Quartz chemical formula SiO2)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Hematitic Sandstone (Sandstone with Hematite inclusions (SiO2 + Fe2O3)) — sedimentary

Hematitic Sandstone

Sandstone with Hematite inclusions (SiO2 + Fe2O3)

Pet Rock (Quartzite/Sandstone River Rock) (Silicon Dioxide (SiO2) mixture) — sedimentary

Pet Rock (Quartzite/Sandstone River Rock)

Silicon Dioxide (SiO2) mixture

Fossilized Coral (Petoskey Stone / Hexagonaria) (Hexagonaria percarinata / Rugosa coral) — fossil

Fossilized Coral (Petoskey Stone / Hexagonaria)

Hexagonaria percarinata / Rugosa coral

Carved Sea Turtle Figurine (Aventurine / Quartz / Jasper) (Quartz variety (SiO2) / Polycrystalline Quartz Aggregate) — mineral

Carved Sea Turtle Figurine (Aventurine / Quartz / Jasper)

Quartz variety (SiO2) / Polycrystalline Quartz Aggregate

Quartz-filled Basalt Geode (Amygdaloidal Basalt with Quartz (SiO2)) — igneous

Quartz-filled Basalt Geode

Amygdaloidal Basalt with Quartz (SiO2)

Cream Marble (Speckled) (Metamorphosed Limestone (mainly CaCO3)) — metamorphic

Cream Marble (Speckled)

Metamorphosed Limestone (mainly CaCO3)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Sandstone (likely Arkosic or Ferruginous) (Arenite (SiO2 with iron oxides or feldspar)) — sedimentary

Sandstone (likely Arkosic or Ferruginous)

Arenite (SiO2 with iron oxides or feldspar)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Mica (Muscovite) (Muscovite (KAl2(AlSi3O10)(OH)2)) — mineral

Mica (Muscovite)

Muscovite (KAl2(AlSi3O10)(OH)2)