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

Basalt (River Pebble) (Basalt) — igneous

Basalt (River Pebble)

Basalt

Jasper (Silicon Dioxide (SiO2) microcrystalline quartz) — sedimentary

Jasper

Silicon Dioxide (SiO2) microcrystalline quartz

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

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2)

Chert (Yellow Jasper variant) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2)

Apache Tear (Obsidian (Hydrated Silica Rich Volcanic Glass)) — igneous

Apache Tear

Obsidian (Hydrated Silica Rich Volcanic Glass)

Eclogite (Eclogite (Omphacite-Garnet Rock)) — metamorphic

Eclogite

Eclogite (Omphacite-Garnet Rock)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Piddock-bored Mudstone (Lutite (Siltstone or Mudstone) with Pholad borings) — sedimentary

Piddock-bored Mudstone

Lutite (Siltstone or Mudstone) with Pholad borings

Granite (Granitoid) — igneous

Granite

Granitoid

Quartzite Pebble (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Quartzite Cobble (Quartzite (primarily SiO2)) — metamorphic

Quartzite Cobble

Quartzite (primarily SiO2)

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

Quartz-encrusted Matrix (Silicon Dioxide (SiO2) with Ferruginous Sandstone) — sedimentary

Quartz-encrusted Matrix

Silicon Dioxide (SiO2) with Ferruginous Sandstone

Sandstone or Mudstone (Sedimentary Rock) — sedimentary

Sandstone or Mudstone

Sedimentary Rock

Garden Pebble (Quartzite or Limestone fragment) (Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) fragment) — sedimentary

Garden Pebble (Quartzite or Limestone fragment)

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) fragment

Basalt Pebble (Mafic Igneous Rock (Basalt/Diabase)) — igneous

Basalt Pebble

Mafic Igneous Rock (Basalt/Diabase)

Obsidian (Volcanic Glass (High silica amorphous rock)) — igneous

Obsidian

Volcanic Glass (High silica amorphous rock)

Quartzite (with Quartz Veining) (Quartzite (SiO2)) — metamorphic

Quartzite (with Quartz Veining)

Quartzite (SiO2)

Quartzite (Metamorphic Quartz-rich Rock) — metamorphic

Quartzite

Metamorphic Quartz-rich Rock

Quartzite (Metamorphic Quartz Rock (SiO2)) — metamorphic

Quartzite

Metamorphic Quartz Rock (SiO2)

Obsidian (Obsidian (Volcanic Glass, complex silicate)) — igneous

Obsidian

Obsidian (Volcanic Glass, complex silicate)

Polished Black Obsidian (Volcanic Glass (70-75% SiO2)) — igneous

Polished Black Obsidian

Volcanic Glass (70-75% SiO2)

Weathered limestone or calcareous sandstone (Calcitic carbonate rock, likely limestone (CaCO₃), possibly slightly dolomitic) — sedimentary

Weathered limestone or calcareous sandstone

Calcitic carbonate rock, likely limestone (CaCO₃), possibly slightly dolomitic

Banded gneiss pebble (Gneiss, typically quartz–feldspar–mica; exact mineral composition requires testing) — metamorphic

Banded gneiss pebble

Gneiss, typically quartz–feldspar–mica; exact mineral composition requires testing

Black Obsidian (Volcanic Glass (SiO2 + impurities)) — igneous

Black Obsidian

Volcanic Glass (SiO2 + impurities)

Chert with Fossil Brachiopod (Microcrystalline Quartz (SiO2) with Calcitic Brachiopod inclusion) — sedimentary

Chert with Fossil Brachiopod

Microcrystalline Quartz (SiO2) with Calcitic Brachiopod inclusion

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

Chert (Flint)

Microcrystalline Silicon Dioxide (SiO2)

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

Chert Arrowhead (Jasper)

Microcrystalline Quartz (SiO2)

Chert (Jasper variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper variety)

Silicon Dioxide (SiO2)

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

Chert (Jasper)

Microcrystalline Quartz (SiO2)

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

Quartzite

Quartzite (composed primarily of SiO2)

Pink granite or granitic gneiss pebble (Granitic rock, mainly quartz, feldspar, and mica; possibly weathered gneiss) — igneous

Pink granite or granitic gneiss pebble

Granitic rock, mainly quartz, feldspar, and mica; possibly weathered gneiss

Black Obsidian (Volcanic Glass (Amorphous SiO2 with trace impurities)) — igneous

Black Obsidian

Volcanic Glass (Amorphous SiO2 with trace impurities)

Amber (Succinite (C10H16O)) — Organic Mineraloid

Amber

Succinite (C10H16O)

Organic Mineraloid

Amber (Succinite (Formula: C10H16O)) — Organic Mineraloid

Amber

Succinite (Formula: C10H16O)

Organic Mineraloid

Amber (Butterscotch/Egg Yolk Variety) (Succinite (Approx. C10H16O)) — Organic Gemstone

Amber (Butterscotch/Egg Yolk Variety)

Succinite (Approx. C10H16O)

Organic Gemstone

Pink Quartzite (Quartzite (SiO2) with trace Iron Oxides) — metamorphic

Pink Quartzite

Quartzite (SiO2) with trace Iron Oxides

Moldavite (Tektite (Impact Glass), ~80% SiO2 + Al2O3) — tektite

Moldavite

Tektite (Impact Glass), ~80% SiO2 + Al2O3

Man-made Synthetic Material (Costume Faux Fur) (Synthetic Polymer (Polyester/Acrylic)) — not a rock

Man-made Synthetic Material (Costume Faux Fur)

Synthetic Polymer (Polyester/Acrylic)

Chert Pebble (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert Pebble

Chert (Microcrystalline Quartz, SiO2)

Bituminous Coal (with Anthracite or Vitrinite inclusion) (Organic-rich Sedimentary Rock (Carboniferous classification)) — sedimentary

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Chert Concretion (Sedimentary Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert Concretion

Sedimentary Cryptocrystalline Quartz (SiO2)