Rock Identifier

Category

Mineral Precipitate (Anthropogenic Context)

Browse mineral precipitate (anthropogenic context) specimens identified by the Rock Identifier community.

Carnelian (Chalcedony (cryptocrystalline quartz), SiO2) — Mineral

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2

Agate (Agate (Cryptocrystalline Variety of Quartz, SiO2)) — Mineral

Agate

Agate (Cryptocrystalline Variety of Quartz, SiO2)

Chert (Flint) Nodule (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint) Nodule

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

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

Milky Quartz (Pebble)

Silicon Dioxide (SiO2)

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

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Slag Glass (Vitreous Silicate Residue) — industrial byproduct (anthropogenic rock)

Slag Glass

Vitreous Silicate Residue

industrial byproduct (anthropogenic rock)

Halite (Halite (NaCl)) — Mineral

Halite

Halite (NaCl)

Asphalt (Bituminous Concrete) (Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)) — not a rock (anthropogenic material/technofossil)

Asphalt (Bituminous Concrete)

Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)

not a rock (anthropogenic material/technofossil)

Sandstone with trace fossil (Sandstone, possibly with Skolithos or similar trace fossil) — sedimentary

Sandstone with trace fossil

Sandstone, possibly with Skolithos or similar trace fossil

Slag (Metallurgical by-product) — Anthropogenic (Man-made material)

Slag

Metallurgical by-product

Anthropogenic (Man-made material)

Chalcedony (Botryoidal or Agate nodule) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Botryoidal or Agate nodule)

Silicon Dioxide (SiO2)

Quartz (Quartzite fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz (Quartzite fragment)

Silicon Dioxide (SiO2)

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Pyrite (Pyrite (Iron Disulfide), FeS2) — Mineral

Pyrite

Pyrite (Iron Disulfide), FeS2

Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment) (Quartz (SiO₂)) — Mineral

Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)

Quartz (SiO₂)

Concrete (Hydrated Portland Cement Aggregate Composite) — Anthropogenic Sedimentary (Man-made)

Concrete

Hydrated Portland Cement Aggregate Composite

Anthropogenic Sedimentary (Man-made)

Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx') (Calcite (Calcium Carbonate, CaCO3)) — sedimentary

Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx')

Calcite (Calcium Carbonate, CaCO3)

Jasper with Quartz Veining (Silicon Dioxide (SiO2) - Opaque cryptocrystalline variety of Quartz) — sedimentary

Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Opaque cryptocrystalline variety of Quartz

Sandstone (Pebble/Conglomerate fragment) (Sandstone (clastic sedimentary rock)) — Sedimentary Rock

Sandstone (Pebble/Conglomerate fragment)

Sandstone (clastic sedimentary rock)

Sedimentary Rock

Quartz Druze on Matrix (Silicon Dioxide (SiO2)) — mineral

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

South Korean 100 Won Coin (Cupronickel) (Cupronickel Alloy (75% Cu, 25% Ni)) — mineral-based alloy (anthropogenic)

South Korean 100 Won Coin (Cupronickel)

Cupronickel Alloy (75% Cu, 25% Ni)

mineral-based alloy (anthropogenic)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Quartz Vein in Host Rock (Silicon Dioxide (SiO2)) — mineral

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Quartz (in matrix) (Quartz (SiO₂)) — mineral

Quartz (in matrix)

Quartz (SiO₂)

Quartz (Silicon Dioxide (SiO2)) — Mineral

Quartz

Silicon Dioxide (SiO2)

Clay Brick (Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)) — metamorphic (man-made/anthropogenic)

Clay Brick

Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)

metamorphic (man-made/anthropogenic)

Quartz Geode (Quartz (Silicon Dioxide - SiO2) within a Chalcedony and Limonite shell) — sedimentary

Quartz Geode

Quartz (Silicon Dioxide - SiO2) within a Chalcedony and Limonite shell

Jasper with Quartz inclusion (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Jasper with Quartz inclusion

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Concrete Rubble with Aggregate (Hardened Portland Cement Paste with Coarse Aggregate) — Anthropogenic (Man-made)

Concrete Rubble with Aggregate

Hardened Portland Cement Paste with Coarse Aggregate

Anthropogenic (Man-made)

Cobalt Blue Sea Glass (Amorphous Silica Glass (SiO2 + CoO)) — mineraloid / anthropogenic material

Cobalt Blue Sea Glass

Amorphous Silica Glass (SiO2 + CoO)

mineraloid / anthropogenic material

Iron Slag (Ferrous Slag (complex silicate and oxide byproduct)) — industrial byproduct (anthropogenic)

Iron Slag

Ferrous Slag (complex silicate and oxide byproduct)

industrial byproduct (anthropogenic)

Jasper and Quartz River Pebble (Silicon Dioxide (SiO2) with impurities) — sedimentary

Jasper and Quartz River Pebble

Silicon Dioxide (SiO2) with impurities

Calcite (Calcite (CaCO3)) — Mineral

Calcite

Calcite (CaCO3)

Moqui Marble (Ironstone Concretion (Goethite/Hematite)) — sedimentary

Moqui Marble

Ironstone Concretion (Goethite/Hematite)

Chert (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Quartz (SiO2)

Jasper and Quartz River Cobble (Silicon Dioxide (SiO2) with Hematite inclusions) — Sedimentary / Metamorphic

Jasper and Quartz River Cobble

Silicon Dioxide (SiO2) with Hematite inclusions

Sedimentary / Metamorphic

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

Turquoise

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

Oolitic Limestone (Oolite (Sedimentary rock composed of CaCO3)) — sedimentary

Oolitic Limestone

Oolite (Sedimentary rock composed of CaCO3)

Black Limestone with Calcite Veining (Bituminous Limestone (CaCO3 with Organic Carbon inclusions)) — sedimentary

Black Limestone with Calcite Veining

Bituminous Limestone (CaCO3 with Organic Carbon inclusions)

Quartz Druzy on Basalt (Silicon Dioxide (SiO2) on Mafic Volcanic Rock) — Mineral on Igneous Rock

Quartz Druzy on Basalt

Silicon Dioxide (SiO2) on Mafic Volcanic Rock

Mineral on Igneous Rock

Banded Iron Formation (Banded Iron Formation (BIF)) — Metamorphic Rock

Banded Iron Formation

Banded Iron Formation (BIF)

Metamorphic Rock