Rock Identifier

Category

Mineral Precipitate (Anthropogenic Context)

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

Learn about Mineral Precipitate (Anthropogenic Context) in the encyclopedia

Glauconite

Hutcheonite

Halite

Sperrylite

Baddeleyite

Anatase

Brookite

Talc

Euxenite

Eltyubyuite

Buergerite

Dolomite

Slag (Glassy silicate byproduct (anthropogenic material)) — industrial byproduct

Slag

Glassy silicate byproduct (anthropogenic material)

industrial byproduct

Painted River Rock (Anthropogenic-modified Siliciclastic Sedimentary Rock) — Sedimentary

Painted River Rock

Anthropogenic-modified Siliciclastic Sedimentary Rock

Ferro-slag (Leland Blue/Slag Glass) (Anthropogenic Vitreous Silica (Industrial Slag)) — igneous

Ferro-slag (Leland Blue/Slag Glass)

Anthropogenic Vitreous Silica (Industrial Slag)

Obsidian Arrowhead (Obsidian (Volcanic Glass)) — igneous

Obsidian Arrowhead

Obsidian (Volcanic Glass)

Conglomerate (Asphaltic/Anthropogenic) (Clastic sedimentary rock / Bituminous mixture) — sedimentary

Conglomerate (Asphaltic/Anthropogenic)

Clastic sedimentary rock / Bituminous mixture

Amethyst Geode Fragment (Quartz (SiO2) with trace iron impurities) — mineral

Amethyst Geode Fragment

Quartz (SiO2) with trace iron impurities

Psilomelane (Black Hematite varietal) (Barium Manganese Oxide (Ba,H2O)2Mn5O10) — mineral

Psilomelane (Black Hematite varietal)

Barium Manganese Oxide (Ba,H2O)2Mn5O10

Chert Nodule (Microcrystalline Silica (SiO2)) — sedimentary

Chert Nodule

Microcrystalline Silica (SiO2)

Gneiss (specifically a water-worn pebble) (Gneiss) — metamorphic

Gneiss (specifically a water-worn pebble)

Gneiss

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Weathered granitic rock (likely granite or granodiorite) (Granite–granodiorite; mainly quartz, feldspar, and mica/hornblende) — igneous

Weathered granitic rock (likely granite or granodiorite)

Granite–granodiorite; mainly quartz, feldspar, and mica/hornblende

Quartz Vein Rock (Silicon dioxide (SiO2) within a host rock matrix) — mineral

Quartz Vein Rock

Silicon dioxide (SiO2) within a host rock matrix

Sandstone (Ferruginous) (Arenite (SiO2 based with Fe2O3 banding)) — sedimentary

Sandstone (Ferruginous)

Arenite (SiO2 based with Fe2O3 banding)

Magnetite (Magnetite (Fe3O4)) — Mineral

Magnetite

Magnetite (Fe3O4)

Red Jasper (Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)) — sedimentary

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Hag Stone (Perforated Sandstone (composed of SiO2 and calcareous cement)) — sedimentary

Hag Stone

Perforated Sandstone (composed of SiO2 and calcareous cement)

Limonite / Ironstone (Hydrated ferric oxide (FeO(OH)·nH2O)) — mineral

Limonite / Ironstone

Hydrated ferric oxide (FeO(OH)·nH2O)

Pyrite (Pyrite (FeS₂)) — Mineral

Pyrite

Pyrite (FeS₂)

Flint or chert (Microcrystalline quartz (SiO₂), commonly chalcedony with possible impurities) — sedimentary

Flint or chert

Microcrystalline quartz (SiO₂), commonly chalcedony with possible impurities

Blue Aventurine (Quartz (SiO2) with inclusions) — mineral

Blue Aventurine

Quartz (SiO2) with inclusions

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Chert Arrowhead (Projectile Point) (Microcrystalline Quartz (Chert or Flint)) — sedimentary

Chert Arrowhead (Projectile Point)

Microcrystalline Quartz (Chert or Flint)

Chert (Arrowhead/Projectile Point) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Arrowhead/Projectile Point)

Cryptocrystalline Quartz (SiO2)

Hematite (likely Botryoidal or Specularite variant) (Iron(III) oxide (Fe2O3)) — mineral

Hematite (likely Botryoidal or Specularite variant)

Iron(III) oxide (Fe2O3)

Native Copper Nugget (Native Copper (Cu)) — mineral

Native Copper Nugget

Native Copper (Cu)

Yellow Chert (Jasper) (Silicon Dioxide (SiO2)) — sedimentary

Yellow Chert (Jasper)

Silicon Dioxide (SiO2)

Likely flint/chert fragments (Microcrystalline quartz (SiO₂), possibly fossil-bearing chert) — sedimentary

Likely flint/chert fragments

Microcrystalline quartz (SiO₂), possibly fossil-bearing chert

Pyrite in Quartz Matrix (Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)) — mineral

Pyrite in Quartz Matrix

Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)

Baryte (Barite) (Barium sulfate (BaSO4)) — mineral

Baryte (Barite)

Barium sulfate (BaSO4)

Dark weathered igneous rock, likely basalt (Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides) — igneous

Dark weathered igneous rock, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides

River Cobble (Conglomerate context) (Unconsolidated Fluvial Alluvium (comprised of various lithologies like Quartzite, Granite, or Basalt)) — sedimentary

River Cobble (Conglomerate context)

Unconsolidated Fluvial Alluvium (comprised of various lithologies like Quartzite, Granite, or Basalt)

Quartz (Quartz (SiO2)) — Mineral

Quartz

Quartz (SiO2)

River Cobble (likely Serpentinite or Greenstone) (Serpentinite / Greenschist facies rock) — metamorphic

River Cobble (likely Serpentinite or Greenstone)

Serpentinite / Greenschist facies rock

Gray volcanic rock, likely basalt (Basalt; primarily plagioclase feldspar, pyroxene, and minor olivine/iron oxides) — igneous

Gray volcanic rock, likely basalt

Basalt; primarily plagioclase feldspar, pyroxene, and minor olivine/iron oxides

Limestone with Quartz or Calcite Veining (Calcium Carbonate (CaCO3) matrix with SiO2 or CaCO3 inclusions) — sedimentary

Limestone with Quartz or Calcite Veining

Calcium Carbonate (CaCO3) matrix with SiO2 or CaCO3 inclusions

Black Jasper (Silicon dioxide (SiO2)) — sedimentary

Black Jasper

Silicon dioxide (SiO2)

Ferruginous Sandstone (with Laterite) (Ferruginous Arenite (FeO(OH)·nH2O)) — sedimentary

Ferruginous Sandstone (with Laterite)

Ferruginous Arenite (FeO(OH)·nH2O)

Grooved Maun Ball (Maul/Hammerstone-like Concretion) (Calcareous/Ferruginous Concretion in Sandstone Matrix) — sedimentary

Grooved Maun Ball (Maul/Hammerstone-like Concretion)

Calcareous/Ferruginous Concretion in Sandstone Matrix

Limonite (Limonitic Sandstone) (Hydrated Iron(III) Oxide-Hydroxide ($FeO(OH)·nH_2O$)) — sedimentary

Limonite (Limonitic Sandstone)

Hydrated Iron(III) Oxide-Hydroxide ($FeO(OH)·nH_2O$)

Yellow Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Arrowhead variety) (Chert (SiO2)) — sedimentary

Chert (Arrowhead variety)

Chert (SiO2)