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

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Sandstone (Quartz Arenite) — sedimentary

Sandstone

Quartz Arenite

Sandstone (Clastic sedimentary rock composed mainly of quartz sand) — sedimentary

Sandstone

Clastic sedimentary rock composed mainly of quartz sand

Sandstone (Quartz Arenite) — sedimentary

Sandstone

Quartz Arenite

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Graphic Granite (Pegmatitic Granite) — igneous

Graphic Granite

Pegmatitic Granite

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz pebble

Silicon dioxide (SiO2)

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Quartz Pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon dioxide (SiO2)

Sandstone (Quartzose Sandstone) — sedimentary

Sandstone

Quartzose Sandstone

Quartzite (Quartzite; predominantly recrystallized quartz (SiO₂)) — metamorphic

Quartzite

Quartzite; predominantly recrystallized quartz (SiO₂)

Milky quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

Rounded gray-green rock, likely gneiss (Gneiss (tentative; mineral composition and texture cannot be confirmed from the image)) — metamorphic

Rounded gray-green rock, likely gneiss

Gneiss (tentative; mineral composition and texture cannot be confirmed from the image)

Milky quartz (Quartz (SiO₂)) — mineral

Milky quartz

Quartz (SiO₂)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Sandstone (Quartz Arenite) — sedimentary

Sandstone

Quartz Arenite

Sandstone (Sedimentary rock composed mainly of quartz sand) — sedimentary

Sandstone

Sedimentary rock composed mainly of quartz sand

Quartz pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz pebble

Silicon dioxide (SiO2)

Greenstone or Metabasalt (Metabasalt / Chlorite Schist) — metamorphic

Greenstone or Metabasalt

Metabasalt / Chlorite Schist

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Jasper / Chert (tumbled/water-worn) (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper / Chert (tumbled/water-worn)

Microcrystalline Quartz (SiO2)

Agate (Cryptocrystalline quartz, Chalcedony (SiO2)) — mineral

Agate

Cryptocrystalline quartz, Chalcedony (SiO2)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone Pebble (Sandstone (primarily Quartz, SiO2)) — sedimentary

Sandstone Pebble

Sandstone (primarily Quartz, SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Red Sandstone or Brick Fragment (Arenite (if sandstone)) — sedimentary

Red Sandstone or Brick Fragment

Arenite (if sandstone)

Tree Agate (Silicon dioxide (SiO2)) — Mineral

Tree Agate

Silicon dioxide (SiO2)

Asphalt (Road Aggregate) (Bituminous conglomerate) — sedimentary

Asphalt (Road Aggregate)

Bituminous conglomerate

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

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of organic matter)

Petrified Wood (Silicified Wood (primarily SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily SiO2)

Greenschist (Greenschist (chlorite schist)) — metamorphic

Greenschist

Greenschist (chlorite schist)

Fossilized tooth fragment, possibly shark tooth (Fossilized vertebrate dental material, composed chiefly of hydroxyapatite) — fossil

Fossilized tooth fragment, possibly shark tooth

Fossilized vertebrate dental material, composed chiefly of hydroxyapatite

Blue-green turquoise (probable) (Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O) — mineral

Blue-green turquoise (probable)

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

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

Serpentinite

Serpentinite; chiefly serpentine-group minerals (lizardite, antigorite, chrysotile), often with magnetite and minor brucite

Fossilized Nut / Coprolite / Concretion (Trace Fossil / Permineralized Plant Material) — fossil

Fossilized Nut / Coprolite / Concretion

Trace Fossil / Permineralized Plant Material

Mottled gabbro or diorite pebble (Coarse-grained mafic/intermediate intrusive rock; chiefly plagioclase feldspar plus pyroxene, with possible amphibole or biotite) — igneous

Mottled gabbro or diorite pebble

Coarse-grained mafic/intermediate intrusive rock; chiefly plagioclase feldspar plus pyroxene, with possible amphibole or biotite

Faience and Carnelian in Egyptian Revival Jewelry (Faience (quartz frit) and Carnelian (chalcedony, SiO2)) — gemstone

Faience and Carnelian in Egyptian Revival Jewelry

Faience (quartz frit) and Carnelian (chalcedony, SiO2)