Rock Identifier

Category

Industrial Byproduct (Anthropogenic Material)

Browse industrial byproduct (anthropogenic material) specimens identified by the Rock Identifier community.

Learn about Industrial Byproduct (Anthropogenic Material) in the encyclopedia

Adirondack Garnet

Adirondack Garnet

Peat

Almandine Garnet

Almandine Garnet

Dunite

Limonite

Shell Opal

Madagascar Opal

Lavender Obsidian

Electric Blue Obsidian

Orange Obsidian

Diamond

Metarhyolite

Chert (Chert (SiO2)) — sedimentary

Chert

Chert (SiO2)

Likely weathered mica schist fragment (Mica schist, chiefly muscovite/biotite mica with quartz and feldspar) — metamorphic

Likely weathered mica schist fragment

Mica schist, chiefly muscovite/biotite mica with quartz and feldspar

Tumbled amethyst (Amethyst, purple quartz (SiO₂), colored by trace iron and irradiation) — gemstone

Tumbled amethyst

Amethyst, purple quartz (SiO₂), colored by trace iron and irradiation

Tumbled amethyst (Quartz, crystalline silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation) — gemstone

Tumbled amethyst

Quartz, crystalline silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Native American Hammerstone / Pitted Stone (Modified lithic artifact (often quartzite, basalt, or granite)) — artifact / sedimentary or igneous rock

Native American Hammerstone / Pitted Stone

Modified lithic artifact (often quartzite, basalt, or granite)

artifact / sedimentary or igneous rock

Chalk (Calcium Carbonate (CaCO3)) — sedimentary

Chalk

Calcium Carbonate (CaCO3)

Celestine (SrSO4) — mineral

Celestine

SrSO4

Unakite (Epidote–pink feldspar–quartz rock) — metamorphic

Unakite

Epidote–pink feldspar–quartz rock

Sapphire (Corundum (Al2O3)) — gemstone

Sapphire

Corundum (Al2O3)

Tumbled Quartz (Silicon Dioxide (SiO2)) — mineral

Tumbled Quartz

Silicon Dioxide (SiO2)

Yellow Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz

Silicon Dioxide (SiO2)

Tourmaline (Schorl (Complex boron silicate, NaFe3Al6(Si6O18)(BO3)3(OH)4)) — mineral

Tourmaline

Schorl (Complex boron silicate, NaFe3Al6(Si6O18)(BO3)3(OH)4)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Mica Schist (Metamorphic rock dominated by micas (muscovite, biotite)) — metamorphic

Mica Schist

Metamorphic rock dominated by micas (muscovite, biotite)

Agate (Silicon Dioxide (Chalcedony), SiO2) — sedimentary

Agate

Silicon Dioxide (Chalcedony), SiO2

Anthracite Coal (Carbon (with organic impurities)) — sedimentary

Anthracite Coal

Carbon (with organic impurities)

Geode (Small unopened nodule) (Quartz-lined nodule (SiO2)) — sedimentary

Geode (Small unopened nodule)

Quartz-lined nodule (SiO2)

Blue Apatite (Apatite Group (Ca5(PO4)3(F,Cl,OH))) — mineral

Blue Apatite

Apatite Group (Ca5(PO4)3(F,Cl,OH))

Diamond (or Diamond Simulant) (Carbon (C) or Cubic Zirconia (ZrO2)) — gemstone

Diamond (or Diamond Simulant)

Carbon (C) or Cubic Zirconia (ZrO2)

Limestone (with possible Crinoid or Fossil Impression) (Calcium Carbonate (CaCO3) / Calcite) — sedimentary

Limestone (with possible Crinoid or Fossil Impression)

Calcium Carbonate (CaCO3) / Calcite

Iron-stained sandstone or weathered ironstone concretion (Quartz-rich sandstone, locally cemented by iron oxides (hematite/goethite); exact identification requires testing) — sedimentary

Iron-stained sandstone or weathered ironstone concretion

Quartz-rich sandstone, locally cemented by iron oxides (hematite/goethite); exact identification requires testing

Pegmatite (Igneous Pegmatite) — igneous

Pegmatite

Igneous Pegmatite

Quartz / Agate Nodule (Silicon Dioxide (SiO2)) — mineral

Quartz / Agate Nodule

Silicon Dioxide (SiO2)

Red Jasper (Silicon dioxide (Microcrystalline Quartz, SiO2)) — sedimentary

Red Jasper

Silicon dioxide (Microcrystalline Quartz, SiO2)

Staurolite (Staurolite (Fe2Al9O6(SiO4)4(O,OH)2)) — mineral

Staurolite

Staurolite (Fe2Al9O6(SiO4)4(O,OH)2)

Pegmatite (Igneous Pegmatite (Quartz, Feldspar, Micas)) — igneous

Pegmatite

Igneous Pegmatite (Quartz, Feldspar, Micas)

Black Tourmaline (Schorl) (Schorl (Complex sodium iron aluminum borosilicate)) — mineral

Black Tourmaline (Schorl)

Schorl (Complex sodium iron aluminum borosilicate)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Ruby (Raw Corundum) (Alumina (Al2O3) with Chromium traces) — gemstone

Ruby (Raw Corundum)

Alumina (Al2O3) with Chromium traces

Mica Schist (Mica Schist (predominantly Muscovite or Biotite series)) — metamorphic

Mica Schist

Mica Schist (predominantly Muscovite or Biotite series)

Schist (Mica Schist) (Mica Schist) — metamorphic

Schist (Mica Schist)

Mica Schist

Vesicular Basalt (Pumice-like) (Vesicular Basalt) — igneous

Vesicular Basalt (Pumice-like)

Vesicular Basalt

Sandstone (Ferruginous) (Arenite (Fe-oxide enriched)) — sedimentary

Sandstone (Ferruginous)

Arenite (Fe-oxide enriched)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Schist (Mica Schist) — metamorphic

Schist

Mica Schist

Ferruginous Quartz (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — mineral

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Garnet (Garnet Group (formula varies: e.g., Almandine Fe3Al2Si3O12 or Pyrope Mg3Al2Si3O12)) — gemstone

Garnet

Garnet Group (formula varies: e.g., Almandine Fe3Al2Si3O12 or Pyrope Mg3Al2Si3O12)