Rock Identifier

Category

Anthropogenic (Man Made Material Processed By Nature)

Browse anthropogenic (man made material processed by nature) specimens identified by the Rock Identifier community.

Learn about Anthropogenic (Man Made Material Processed By Nature) in the encyclopedia

Opalite

Goldstone

Blue Goldstone

Dunite

Zincite

Emerald Crystal

Emerald Crystal

Orange Obsidian

Diamond

Lavender Obsidian

Electric Blue Obsidian

Tripolite

Violet Obsidian

Weathered limestone or calcareous fossil fragment (Calcite-rich carbonate rock (CaCO₃), possibly fossiliferous limestone) — sedimentary

Weathered limestone or calcareous fossil fragment

Calcite-rich carbonate rock (CaCO₃), possibly fossiliferous limestone

Quartz–feldspar pegmatite specimen (Granitic pegmatite, chiefly quartz (SiO₂), potassium feldspar (KAlSi₃O₈), and mica-group minerals) — igneous

Quartz–feldspar pegmatite specimen

Granitic pegmatite, chiefly quartz (SiO₂), potassium feldspar (KAlSi₃O₈), and mica-group minerals

Green glassy slag or manufactured glass bead (Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral) — mineral

Green glassy slag or manufactured glass bead

Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral

Moss Agate (Crescent Moon Shape) (Silicon Dioxide (SiO2) with iron/manganese inclusions) — mineral

Moss Agate (Crescent Moon Shape)

Silicon Dioxide (SiO2) with iron/manganese inclusions

Iron-rich weathered rock, likely limonite/goethite-bearing laterite (Limonite (variable hydrated iron oxides; chiefly goethite, α-FeO(OH))) — mineral

Iron-rich weathered rock, likely limonite/goethite-bearing laterite

Limonite (variable hydrated iron oxides; chiefly goethite, α-FeO(OH))

Quartz (SiO2) — mineral

Quartz

SiO2

Olivine ((Mg,Fe)2SiO4) — mineral

Olivine

(Mg,Fe)2SiO4

Milky Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (with Manganese staining) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (with Manganese staining)

Arenite (composed primarily of SiO2)

Schist (Schist (Crystalline metamorphic rock)) — metamorphic

Schist

Schist (Crystalline metamorphic rock)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Dyed Blue Quartz (Silicon Dioxide (SiO2) with artificial pigment) — mineral

Dyed Blue Quartz

Silicon Dioxide (SiO2) with artificial pigment

Ruby (or potential synthetic/imitation) (Corundum (Al2O3)) — gemstone

Ruby (or potential synthetic/imitation)

Corundum (Al2O3)

Sandstone (Ferruginous) (Arenite (with Iron Oxide cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Quartzite Pebble (Quartzite (mostly SiO2)) — metamorphic

Quartzite Pebble

Quartzite (mostly SiO2)

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

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Arenite (SiO2 principal)) — sedimentary

Sandstone

Arenite (SiO2 principal)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Sandstone (Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (Sandstone (Sedimentary rock composed of silicate grains)) — sedimentary

Sandstone

Sandstone (Sedimentary rock composed of silicate grains)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Olivine (Peridot) (Olivine Group (Mg,Fe)2SiO4) — mineral

Olivine (Peridot)

Olivine Group (Mg,Fe)2SiO4

Coarse-grained granite or granitic pegmatite (Granite; primarily quartz (SiO₂), feldspar, and mica/amphibole) — igneous

Coarse-grained granite or granitic pegmatite

Granite; primarily quartz (SiO₂), feldspar, and mica/amphibole

Dark mafic igneous rock, likely basalt or gabbro (Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine) — igneous

Dark mafic igneous rock, likely basalt or gabbro

Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine

Granite-like rock (Felsic intrusive igneous rock, likely granite or granodiorite) — igneous

Granite-like rock

Felsic intrusive igneous rock, likely granite or granodiorite

Polished pink feldspar pebble (Orthoclase or microcline feldspar, KAlSi₃O₈; exact identification is uncertain from the image) — mineral

Polished pink feldspar pebble

Orthoclase or microcline feldspar, KAlSi₃O₈; exact identification is uncertain from the image

Quartz-veined Siltstone (Siltstone with Quartz (SiO2) veins) — sedimentary

Quartz-veined Siltstone

Siltstone with Quartz (SiO2) veins

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Quartz Pebble (Quartz (Silicon Dioxide, SiO2)) — sedimentary

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Sandstone (Ferruginous) (Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)) — sedimentary

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Sandstone (Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Limestone (Calcareous sedimentary rock (primarily Calcium Carbonate, CaCO3)) — sedimentary

Limestone

Calcareous sedimentary rock (primarily Calcium Carbonate, CaCO3)

Fossilized shell or brachiopod (Likely a calcareous brachiopod or bivalve fossil; exact identification requires clearer detail and scale) — fossil

Fossilized shell or brachiopod

Likely a calcareous brachiopod or bivalve fossil; exact identification requires clearer detail and scale

Sandstone Pebble (Sandstone (primarily SiO2)) — sedimentary

Sandstone Pebble

Sandstone (primarily SiO2)

Sandstone (likely Quartzose) (Arenite (SiO2 principal mineral)) — sedimentary

Sandstone (likely Quartzose)

Arenite (SiO2 principal mineral)

Sandstone (Ferruginous) (Arenite (SiO2 with Fe2O3 cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 cement)

Pegmatite (Quartz with Tourmaline/Biotite inclusions) (Igneous Pegmatite) — igneous

Pegmatite (Quartz with Tourmaline/Biotite inclusions)

Igneous Pegmatite

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Sandstone (Sedimentary Rock (Quartz arenite)) — sedimentary

Sandstone

Sedimentary Rock (Quartz arenite)