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

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

Chert (Jasper/Flint)

Microcrystalline Quartz (SiO2)

Sandstone (Sandstone (SiO2-dominated clastic rock)) — sedimentary

Sandstone

Sandstone (SiO2-dominated clastic rock)

Jasper (Silicon dioxide (Microcrystalline quartz, SiO2)) — mineral

Jasper

Silicon dioxide (Microcrystalline quartz, SiO2)

Chert (often called Flint in various colors) (Silicon Dioxide (SiO2)) — sedimentary

Chert (often called Flint in various colors)

Silicon Dioxide (SiO2)

Fossiliferous Limestone (Coquina) (Calcite (CaCO3) with Bioclastic inclusions) — sedimentary

Fossiliferous Limestone (Coquina)

Calcite (CaCO3) with Bioclastic inclusions

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

Petrified Wood

Silicified wood (primarily quartz, SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Jasper/Flint Pebble) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Jasper/Flint Pebble)

Microcrystalline quartz (SiO2)

Conglomerate (Conglomerate (Clastic Sedimentary Rock)) — sedimentary

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

Turquoise bead necklace (Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; likely stabilized or imitation beads cannot be ruled out from the image) — gemstone

Turquoise bead necklace

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; likely stabilized or imitation beads cannot be ruled out from the image

Rounded brown river pebble (Indeterminate lithic fragment; possibly weathered sandstone, mudstone, or basalt) — sedimentary

Rounded brown river pebble

Indeterminate lithic fragment; possibly weathered sandstone, mudstone, or basalt

Limestone (Calcareous sedimentary rock (CaCO3)) — sedimentary

Limestone

Calcareous sedimentary rock (CaCO3)

Limestone Pebble (Calcareous sedimentary rock (CaCO3)) — sedimentary

Limestone Pebble

Calcareous sedimentary rock (CaCO3)

Polished labradorite (Labradorite, Ca(Al2Si2O8)–NaAlSi3O8 (plagioclase feldspar)) — mineral

Polished labradorite

Labradorite, Ca(Al2Si2O8)–NaAlSi3O8 (plagioclase feldspar)

Pebble / Sandstone / Siltstone (Sedimentary Rock (Quartz Sandstone / Siltstone)) — sedimentary

Pebble / Sandstone / Siltstone

Sedimentary Rock (Quartz Sandstone / Siltstone)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Sandstone (River Cobble) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2)

River Rock (Basalt or Siltstone) (Basalt (Aphanitic Igneous Rock)) — igneous

River Rock (Basalt or Siltstone)

Basalt (Aphanitic Igneous Rock)

Quartzite with inclusions (Metamorphic Rock (Mainly SiO2)) — metamorphic

Quartzite with inclusions

Metamorphic Rock (Mainly SiO2)

Black Obsidian (Volcanic glass) — igneous

Black Obsidian

Volcanic glass

Fossiliferous Limestone (Biogenic Sedimentary Rock (CaCO3)) — sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock (CaCO3)

Quartzite Cobble (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite Cobble

Metamorphosed Quartz Sandstone (SiO2)

Limestone with Calcite Veins (Calcium Carbonate (CaCO3)) — sedimentary

Limestone with Calcite Veins

Calcium Carbonate (CaCO3)

Limestone (Calcium carbonate, CaCO3) — sedimentary

Limestone

Calcium carbonate, CaCO3

Coprolite (Fossilized Feces) — fossil

Coprolite

Fossilized Feces

Dendritic Opal (Common Opal) (Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions) — mineral

Dendritic Opal (Common Opal)

Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions

Dark gray flint or chert fragment (Microcrystalline quartz (SiO₂), commonly with minor chalcedony and impurities) — sedimentary

Dark gray flint or chert fragment

Microcrystalline quartz (SiO₂), commonly with minor chalcedony and impurities

Pearls (Pearl: biomineralized aragonite (CaCO₃) and conchiolin) — gemstone

Pearls

Pearl: biomineralized aragonite (CaCO₃) and conchiolin

Snowflake Obsidian (Volcanic Glass (spherulitic obsidian)) — igneous

Snowflake Obsidian

Volcanic Glass (spherulitic obsidian)

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

Siltstone

Siltstone (composed of microscopic quartz and clay minerals)

Black Mountain Stone (Seiryu Stone) (Limestone with Calcite veins (CaCO3)) — sedimentary

Black Mountain Stone (Seiryu Stone)

Limestone with Calcite veins (CaCO3)

Siltstone Pebble (Siltstone (fine-grained siliciclastic sedimentary rock)) — sedimentary

Siltstone Pebble

Siltstone (fine-grained siliciclastic sedimentary rock)

Jasper (Silicon dioxide with iron impurities (SiO2)) — sedimentary

Jasper

Silicon dioxide with iron impurities (SiO2)

Petrified Wood (Silicified Wood (Quartz replacement of organic wood)) — fossil

Petrified Wood

Silicified Wood (Quartz replacement of organic wood)

Fossilized Bone Fragment (Vertebrate Fossil) — fossil

Fossilized Bone Fragment

Vertebrate Fossil

Snowflake Obsidian (Volcanic glass (SiO2) with Cristobalite (SiO2) inclusions) — igneous

Snowflake Obsidian

Volcanic glass (SiO2) with Cristobalite (SiO2) inclusions

Moldavite (Moldavite (Siliceous vitreous substance)) — tektite (natural glass)

Moldavite

Moldavite (Siliceous vitreous substance)

tektite (natural glass)

Petrified Wood (Fossilized Xylem (SiO2)) — fossil

Petrified Wood

Fossilized Xylem (SiO2)

Blue Opal in Matrix (Hydrated Silica (SiO2·nH2O)) — mineral

Blue Opal in Matrix

Hydrated Silica (SiO2·nH2O)

Quartzite Pebble (Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Quartzite (SiO2)

Chert (Nodule) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss