Rock Identifier

Category

Organic Material (Likely A Fruit Or Berry)

Browse organic material (likely a fruit or berry) specimens identified by the Rock Identifier community.

Learn about Organic Material (Likely A Fruit Or Berry) in the encyclopedia

Peat

Orange Obsidian

Sapropel

Bituminous Shale

Bituminous Shale

Black Shale

Amber

Lizard Skin Jasper

Petrified Wood

Jet

Oil Shale

Limonite

Tangerine Obsidian

Likely tumbled jasper or iron-rich chert (Microcrystalline quartz (SiO₂), potentially hematite/goethite-bearing) — mineral

Likely tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), potentially hematite/goethite-bearing

Chert (Green Chert or Jasper) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Green Chert or Jasper)

Microcrystalline Quartz (SiO2)

Petrified Wood (Fossilized Wood (SiO2 replacing organic matter)) — fossil

Petrified Wood

Fossilized Wood (SiO2 replacing organic matter)

Weathered river pebble, likely quartz-rich sandstone or iron-stained quartzite (Provisional identification: quartz-rich sandstone/quartzite; exact composition cannot be confirmed from the image) — sedimentary

Weathered river pebble, likely quartz-rich sandstone or iron-stained quartzite

Provisional identification: quartz-rich sandstone/quartzite; exact composition cannot be confirmed from the image

Porphyritic Basalt (Peanut Obsidian/Star Galaxy-style) (Porphyritic Basalt (Silica-rich Volcanic Rock)) — igneous

Porphyritic Basalt (Peanut Obsidian/Star Galaxy-style)

Porphyritic Basalt (Silica-rich Volcanic Rock)

Chert or flint with chalcedony/quartz veins (Microcrystalline silica: primarily quartz (SiO₂), including chalcedony; possible fossiliferous limestone or silicified material) — sedimentary

Chert or flint with chalcedony/quartz veins

Microcrystalline silica: primarily quartz (SiO₂), including chalcedony; possible fossiliferous limestone or silicified material

Weathered reddish-brown rock fragment (Probably altered basalt or fine-grained volcanic rock; exact identification requires testing) — igneous

Weathered reddish-brown rock fragment

Probably altered basalt or fine-grained volcanic rock; exact identification requires testing

Milky Quartz Pebble (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Sandstone (with Iron Staining) (Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)) — sedimentary

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)

Magnetite or Ironstone Nodule (Magnetite (Fe3O4) or Hematite-rich Sedimentary Nodule) — mineral

Magnetite or Ironstone Nodule

Magnetite (Fe3O4) or Hematite-rich Sedimentary Nodule

Chert (Light Variety) (Sedimentary cryptocrystalline quartz (SiO2)) — sedimentary

Chert (Light Variety)

Sedimentary cryptocrystalline quartz (SiO2)

Green Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Green Chert

Microcrystalline Quartz (SiO2)

Sandstone (Sedimentary Rock) (Arenite (SiO2 based)) — sedimentary

Sandstone (Sedimentary Rock)

Arenite (SiO2 based)

Polished mahogany obsidian (likely) (Volcanic glass; primarily silica-rich rhyolitic glass (SiO₂), with iron oxides) — igneous

Polished mahogany obsidian (likely)

Volcanic glass; primarily silica-rich rhyolitic glass (SiO₂), with iron oxides

Shark Tooth Fossil (Otodus obliquus (or similar prehistoric lamniform shark tooth)) — fossil

Shark Tooth Fossil

Otodus obliquus (or similar prehistoric lamniform shark tooth)

Megalodon Shark Tooth (Otodus megalodon) — fossil

Megalodon Shark Tooth

Otodus megalodon

Petrified Wood (Silicified wood (primarily quartz, SiO2)) — fossil

Petrified Wood

Silicified wood (primarily quartz, SiO2)

Petrified Wood (Silicified wood (primarily quartz, SiO2)) — sedimentary

Petrified Wood

Silicified wood (primarily quartz, SiO2)

Sandstone Pebble (River Rock) (Sandstone (Quartz-rich sedimentary rock with iron oxide staining)) — sedimentary

Sandstone Pebble (River Rock)

Sandstone (Quartz-rich sedimentary rock with iron oxide staining)

Chert (Flint Nodule) (Microcrystalline and Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint Nodule)

Microcrystalline and Cryptocrystalline Quartz (SiO2)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Sandstone (Red / Iron-stained) (Sandstone (composed predominantly of SiO2 with Fe2O3 cement)) — sedimentary

Sandstone (Red / Iron-stained)

Sandstone (composed predominantly of SiO2 with Fe2O3 cement)

Jasper (Green Jasper / Chert) (Silicon Dioxide (SiO2 with inclusions)) — mineral

Jasper (Green Jasper / Chert)

Silicon Dioxide (SiO2 with inclusions)

Petoskey Stone (Hexagonaria percarinata (Calcite / CaCO3)) — fossil

Petoskey Stone

Hexagonaria percarinata (Calcite / CaCO3)

Fossilized Shark Tooth (Elasmobranchii dentition (calcium phosphate / hydroxyapatite)) — fossil

Fossilized Shark Tooth

Elasmobranchii dentition (calcium phosphate / hydroxyapatite)

Petrified Wood (Silicified Wood (SiO2)) — metamorphic

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood (Silicified Wood (primarily SiO₂ / Silicon Dioxide)) — mineral

Petrified Wood

Silicified Wood (primarily SiO₂ / Silicon Dioxide)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Chert (Jasper/Common Opal transition) (Microcrystalline Quartz (SiO2) with iron oxide inclusions) — sedimentary

Chert (Jasper/Common Opal transition)

Microcrystalline Quartz (SiO2) with iron oxide inclusions

Chert (Blue-Gray Chert) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Blue-Gray Chert)

Microcrystalline quartz (SiO2)

Rounded white pebble, likely quartz-rich rock (Most consistent with quartzite or milky-quartz pebble; exact identification requires testing) — sedimentary

Rounded white pebble, likely quartz-rich rock

Most consistent with quartzite or milky-quartz pebble; exact identification requires testing

Chert (Yellow Jasper) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Chert (Flint) (Silicon dioxide (SiO2)) — sedimentary

Chert (Flint)

Silicon dioxide (SiO2)

Fossilized Brachiopod (Phylum Brachiopoda (likely Order Spiriferida or Orthida)) — fossil

Fossilized Brachiopod

Phylum Brachiopoda (likely Order Spiriferida or Orthida)

Tumbled dark green stone, likely serpentine (Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄)) — metamorphic

Tumbled dark green stone, likely serpentine

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄)

Flagstone paving (likely sandstone or limestone) (Clastic sandstone or carbonate limestone; exact identification requires testing) — sedimentary

Flagstone paving (likely sandstone or limestone)

Clastic sandstone or carbonate limestone; exact identification requires testing

Chert (or Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (or Flint)

Microcrystalline Quartz (SiO2)

Chert (Red/Pink Jasper subtype) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Red/Pink Jasper subtype)

Silicon Dioxide (SiO2)

Amber (Succinite (Resinite)) — mineraloid

Amber

Succinite (Resinite)

Chert (Flint) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Silica (SiO2)

Quartz-rich metamorphic rock, likely quartzite (Quartzite; predominantly crystalline SiO₂, possibly with iron-oxide staining and minor feldspar or mica) — metamorphic

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with iron-oxide staining and minor feldspar or mica