Rock Identifier

Category

Anthropogenic Material

Browse anthropogenic material specimens identified by the Rock Identifier community.

Learn about Anthropogenic Material in the encyclopedia

Peat

Dunite

Limonite

Shell Opal

Madagascar Opal

Lavender Obsidian

Electric Blue Obsidian

Orange Obsidian

Diamond

Metarhyolite

Rhodochrosite

Peacock Opal

Unidentified weathered mineral/rock fragment (Indeterminate; likely a weathered iron-rich silicate or sulfide-bearing specimen) — mineral

Unidentified weathered mineral/rock fragment

Indeterminate; likely a weathered iron-rich silicate or sulfide-bearing specimen

Moldavite (Tektite) — meteorite

Moldavite

Tektite

Chondrite Meteorite (Ordinary Chondrite (L, LL, or H type)) — meteorite

Chondrite Meteorite

Ordinary Chondrite (L, LL, or H type)

Fossilized Shark Tooth (Partial) or Coprolite (Elasmobranchii (fossil) or Coprolite (trace fossil)) — fossil

Fossilized Shark Tooth (Partial) or Coprolite

Elasmobranchii (fossil) or Coprolite (trace fossil)

Graphite (Graphite (Carbon, C)) — mineral

Graphite

Graphite (Carbon, C)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Shark Tooth Fossil (Carcharocles megalodon or similar extinct shark tooth) — fossil

Shark Tooth Fossil

Carcharocles megalodon or similar extinct shark tooth

Jasper (Microcrystalline quartz (SiO2)) — sedimentary

Jasper

Microcrystalline quartz (SiO2)

Brown Quartz (Jasper or Chert) (Silicon Dioxide (SiO2)) — sedimentary

Brown Quartz (Jasper or Chert)

Silicon Dioxide (SiO2)

Nacre (Mother of Pearl) (Nacre (Biogenic Aragonite/Calcite composite, CaCO3)) — mineral

Nacre (Mother of Pearl)

Nacre (Biogenic Aragonite/Calcite composite, CaCO3)

Chert (Chert (SiO2)) — sedimentary

Chert

Chert (SiO2)

Thunderegg (Agate or Quartz Geode) (Silica-filled rhyolitic nodule (SiO2)) — sedimentary

Thunderegg (Agate or Quartz Geode)

Silica-filled rhyolitic nodule (SiO2)

Banded Gneiss (Gneiss) — metamorphic

Banded Gneiss

Gneiss

Red Sandstone (Sandstone with Hematite cement) — sedimentary

Red Sandstone

Sandstone with Hematite cement

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Sandstone (Sedimentary Clastic Rock (Quartz-rich)) — sedimentary

Sandstone

Sedimentary Clastic Rock (Quartz-rich)

Quartzite / Iron-stained Chert (Silicon Dioxide (SiO2) with Iron Oxide impurities) — metamorphic

Quartzite / Iron-stained Chert

Silicon Dioxide (SiO2) with Iron Oxide impurities

Gravel / Small Pebble (Rock Fragment (Gravel)) — sedimentary

Gravel / Small Pebble

Rock Fragment (Gravel)

Sandstone (Sandstone (SiO2 with iron oxides and clay)) — sedimentary

Sandstone

Sandstone (SiO2 with iron oxides and clay)

Pebble / Rounded Rock (Lithic fragment / Water-worn rock) — sedimentary

Pebble / Rounded Rock

Lithic fragment / Water-worn rock

Sandstone (Pebble / Cobble) (Arenite / Sedimentary Rock (composed of quartz and feldspar)) — sedimentary

Sandstone (Pebble / Cobble)

Arenite / Sedimentary Rock (composed of quartz and feldspar)

Quartz (Iron-Stained / Yellow Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-Stained / Yellow Quartz)

Silicon Dioxide (SiO2)

Chiastolite (Andalusite variety Chiastolite) — mineral

Chiastolite

Andalusite variety Chiastolite

Quartz Pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon dioxide (SiO2)

Quartz Pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz pebble (Silicon dioxide (SiO2)) — mineral

Quartz pebble

Silicon dioxide (SiO2)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Potassium-Rich Silicate Clay (inferred from biological context) (Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)) — mineral

Potassium-Rich Silicate Clay (inferred from biological context)

Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Sedimentary Sandstone (Sandstone Slab) (Arenite (SiO2 with Fe2O3 staining)) — sedimentary

Sedimentary Sandstone (Sandstone Slab)

Arenite (SiO2 with Fe2O3 staining)

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

Chert (Flint)

Silicon Dioxide (SiO2)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

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

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (with Iron Staining) (Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)) — sedimentary

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)

Sandstone (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of SiO2)

Weathered quartz-rich rock, possibly quartzite or silicified breccia (Quartzite (predominantly SiO₂); exact identification requires a fresh surface and tests) — metamorphic

Weathered quartz-rich rock, possibly quartzite or silicified breccia

Quartzite (predominantly SiO₂); exact identification requires a fresh surface and tests

Serpentinite (serpentine-rich metamorphic rock) (Serpentine-group minerals, chiefly antigorite, lizardite, and chrysotile; commonly with magnetite and minor brucite) — metamorphic

Serpentinite (serpentine-rich metamorphic rock)

Serpentine-group minerals, chiefly antigorite, lizardite, and chrysotile; commonly with magnetite and minor brucite

Serpentine-rich rock (likely serpentinite) (Serpentinite; chiefly antigorite, lizardite, or chrysotile Mg₃Si₂O₅(OH)₄) — metamorphic

Serpentine-rich rock (likely serpentinite)

Serpentinite; chiefly antigorite, lizardite, or chrysotile Mg₃Si₂O₅(OH)₄