Rock Identifier

Category

Organic (Non Rock)

Browse organic (non rock) specimens identified by the Rock Identifier community.

Learn about Organic (Non Rock) in the encyclopedia

Mudstone

Bituminous Shale

Bituminous Shale

Hornfels

Black Shale

Oil Shale

Argillite

Sapropel

Shale (Mudstone (composed primarily of clay minerals like kaolinite, illite, and smectite, with quartz and calcite)) — sedimentary

Shale

Mudstone (composed primarily of clay minerals like kaolinite, illite, and smectite, with quartz and calcite)

Green aventurine (likely) (Quartzite dominated by quartz (SiO₂), colored green by fuchsite mica or chlorite) — mineral

Green aventurine (likely)

Quartzite dominated by quartz (SiO₂), colored green by fuchsite mica or chlorite

Obsidian (Volcanic Glass (SiO2)) — igneous

Obsidian

Volcanic Glass (SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Siltstone (Siltstone (primarily composed of quartz and clay minerals)) — sedimentary

Siltstone

Siltstone (primarily composed of quartz and clay minerals)

Shale (or Slate / Coal / Jet) (Laminated fine-grained sedimentary rock (predominantly clay minerals)) — sedimentary

Shale (or Slate / Coal / Jet)

Laminated fine-grained sedimentary rock (predominantly clay minerals)

Earth (Terra / Earth) — igneous, sedimentary, and metamorphic

Earth

Terra / Earth

igneous, sedimentary, and metamorphic

Quartzite Cobble (Metamorphosed Sandstone (SiO2)) — metamorphic

Quartzite Cobble

Metamorphosed Sandstone (SiO2)

Eclogite (Eclogite (Pyrope garnet and Omphacite pyroxene)) — metamorphic

Eclogite

Eclogite (Pyrope garnet and Omphacite pyroxene)

Sandstone (Ferruginous) (Clastic Sedimentary Rock (Sandstone)) — sedimentary

Sandstone (Ferruginous)

Clastic Sedimentary Rock (Sandstone)

Limestone Pebble (Sedimentary carbonate rock (CaCO3)) — sedimentary

Limestone Pebble

Sedimentary carbonate rock (CaCO3)

Granite (Granite (quartz–feldspar intrusive igneous rock)) — igneous

Granite

Granite (quartz–feldspar intrusive igneous rock)

Quartzite (Quartzite (composed primarily of SiO2)) — metamorphic

Quartzite

Quartzite (composed primarily of SiO2)

Jasper (Iron-stained Chert) (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Opal (Hydrated Amorphous Silica (SiO2·nH2O)) — mineral

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Jasper (Silicon Dioxide (Microcrystalline Quartz, SiO2)) — mineral

Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Quartzite Cobble (Quartzite (principally SiO2)) — metamorphic

Quartzite Cobble

Quartzite (principally SiO2)

Green Glass Slag (Amorphous Silicon Dioxide (SiO2) with metal oxide impurities) — mineraloid (man-made)

Green Glass Slag

Amorphous Silicon Dioxide (SiO2) with metal oxide impurities

mineraloid (man-made)

Pink Marble (Recrystallized Limestone (Calcium Carbonate, CaCO3)) — metamorphic

Pink Marble

Recrystallized Limestone (Calcium Carbonate, CaCO3)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Granite Cobble (Granite (Porphyritic/Coarse-grained)) — igneous

Granite Cobble

Granite (Porphyritic/Coarse-grained)

Quartzite Cobble (Quartzite (SiO2 based metamorphic rock)) — metamorphic

Quartzite Cobble

Quartzite (SiO2 based metamorphic rock)

Microcrystalline Quartz (Chert/Agate) (Silicon Dioxide (SiO2)) — sedimentary

Microcrystalline Quartz (Chert/Agate)

Silicon Dioxide (SiO2)

Chert Nodule / Ironstone Concretion (Microcrystalline Quartz (SiO2) with Iron Oxides) — sedimentary

Chert Nodule / Ironstone Concretion

Microcrystalline Quartz (SiO2) with Iron Oxides

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

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

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

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Quartzite (Metamorphic quartz rock (SiO2)) — metamorphic

Quartzite

Metamorphic quartz rock (SiO2)

Fossil Coral (Petoskey / Horn Coral Sliced Button) (Scleractinia / Rugosa (Silurian-Devonian Anthozoa)) — fossil

Fossil Coral (Petoskey / Horn Coral Sliced Button)

Scleractinia / Rugosa (Silurian-Devonian Anthozoa)

Heart-shaped Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Heart-shaped Limestone

Calcium Carbonate (CaCO3)

Quartzite River Rock (Metamorphic Quartzite (primarily SiO2)) — metamorphic

Quartzite River Rock

Metamorphic Quartzite (primarily SiO2)

Coal (Carbonaceous sedimentary rock (C)) — sedimentary

Coal

Carbonaceous sedimentary rock (C)

Basalt (River Rock) (Basalt (Mafic volcanic rock)) — igneous

Basalt (River Rock)

Basalt (Mafic volcanic rock)

Shale or Mudstone (Argillaceous sedimentary rock) — sedimentary

Shale or Mudstone

Argillaceous sedimentary rock

Limestone (Calcareous sedimentary rock (CaCO3)) — sedimentary

Limestone

Calcareous sedimentary rock (CaCO3)

Quartzite River Rock (Quartzite (SiO2)) — metamorphic

Quartzite River Rock

Quartzite (SiO2)

Quartzite River Rock (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite River Rock

Metamorphic Quartzite (SiO2)

Pearl strand (Nacreous pearl, primarily aragonite (CaCO₃) with conchiolin protein) — gemstone

Pearl strand

Nacreous pearl, primarily aragonite (CaCO₃) with conchiolin protein

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

Chert (Flint)

Silicon Dioxide (SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

River Rock (likely Siltstone or fine-grained Sandstone) (Clastic Sedimentary Rock) — sedimentary

River Rock (likely Siltstone or fine-grained Sandstone)

Clastic Sedimentary Rock

Obsidian (Volcanic Glass (Amorphous Silicon Dioxide)) — igneous

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Quartzite (Orthoquartzite) (SiO2 (Silicon Dioxide) with Iron Oxide inclusions) — metamorphic

Quartzite (Orthoquartzite)

SiO2 (Silicon Dioxide) with Iron Oxide inclusions