Anthropogenic (Man Made Industrial Byproduct)

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

Hypersthene (or Enstatite/Ferrosilite)

Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)

Mineral

Scoria

Scoria (a vesicular basalt or andesite)

igneous

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

sedimentary

Sapphire (likely blue synthetic sapphire or blue glass in a ring)

Corundum (Al₂O₃), specifically the blue variety due to trace amounts of iron and titanium impurities. If synthetic, it would still be Al₂O₃.

Mineral

Pearl

Aragonite (CaCO3 with conchiolin)

mineral

Bauxite

Bauxite (principal ore of aluminum, primarily Al(OH)3)

sedimentary

Nacre (Mother of Pearl)

Nacre (Biogenic Aragonite/Calcite composite, CaCO3)

mineral

Sandstone (likely Fossiliferous)

Arenite / Fossiliferous Sandstone (SiO2 composition)

sedimentary

Quartz with Mica (Micaceous Quartz)

Silicon Dioxide (SiO2) with Phyllosilicates

igneous/metamorphic

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

sedimentary

Chert (specifically White Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Pearl

Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)

mineral

Quartzite (or Iron-Stained Quartz Pebble)

Silicon Dioxide (SiO2) with Ferric Oxide inclusions

metamorphic

Jasper (yellow/cream variety)

SiO₂ (Cryptocrystalline Quartz)

Sedimentary

Pearl (with Peridot)

Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4

mineral

Sandstone (likely Quartzose Sandstone)

Arenite

sedimentary

Sandstone

Arenite

sedimentary

Chalk

Micrite (primarily Calcium Carbonate, CaCO3)

sedimentary

Pearl

Aragonite (CaCO3) with Conchiolin

mineral

Serpentine

Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)

metamorphic

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

mineral

Quartzite

Quartzite (SiO2)

metamorphic

Fluorite (likely)

Calcium Fluoride (CaF2)

Mineral

Granodiorite with Quartz Veining

Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins

igneous

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

igneous

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

igneous

Pyrite

Iron Sulfide (FeS2)

mineral

Pyrite

Iron Disulfide (FeS2)

mineral

Rhodonite

Rhodonite (MnSiO3)

mineral

Lazulite

Lazulite (Mg,Fe2+)Al2(PO4)2(OH)2

mineral

Quartz (Microcrystalline/Chert)

Silicon Dioxide (SiO2)

mineral

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Pyrite

Pyrite (Iron sulfide, FeS₂)

mineral

Chert (variations include Flint/Novaculite)

Chert (formula: SiO2)

sedimentary

Chert (often called Flint for darker varieties)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

sedimentary

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

mineral

Pearl (Biogenic Mineraloid)

Calcium carbonate (Aragonite) and Conchiolin, CaCO3

mineral

Garnet Schist

Almandine Garnet-Mica Schist (X₃Y₂(SiO₄)₃)

metamorphic

Anthracite Coal

Anthracite (Carbon-based metamorphic rock)

metamorphic

Honey Calcite

Calcium Carbonate (CaCO3)

mineral

Diamond

Diamond (pure Carbon, C)

mineral

Banded Agate (Brazilian Agate Slice)

Chalcedony (Silicon Dioxide / SiO2)

Mineral