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

Calcite crystal cluster (Calcite, calcium carbonate (CaCO₃)) — mineral

Calcite crystal cluster

Calcite, calcium carbonate (CaCO₃)

Specular hematite (micaceous hematite) (Hematite, iron(III) oxide (Fe₂O₃), likely with minor quartz or iron oxides) — mineral

Specular hematite (micaceous hematite)

Hematite, iron(III) oxide (Fe₂O₃), likely with minor quartz or iron oxides

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

Amethyst

Quartz (Silicon Dioxide, SiO2)

Blue Onyx (Agate) (Cryptocrystalline Quartz (SiO2)) — mineral

Blue Onyx (Agate)

Cryptocrystalline Quartz (SiO2)

Chalcedony (Agate/Chert) (Microcrystalline Quartz (SiO2)) — mineral

Chalcedony (Agate/Chert)

Microcrystalline Quartz (SiO2)

Black Marble (Veined Limestone/Marble) (Recrystallized Limestone / Metamorphic Calcite (CaCO3)) — metamorphic

Black Marble (Veined Limestone/Marble)

Recrystallized Limestone / Metamorphic Calcite (CaCO3)

Native copper-bearing rock (probable copper ore) (Native copper (Cu), likely with cuprite (Cu₂O), malachite (Cu₂CO₃(OH)₂), and iron-oxide matrix) — mineral

Native copper-bearing rock (probable copper ore)

Native copper (Cu), likely with cuprite (Cu₂O), malachite (Cu₂CO₃(OH)₂), and iron-oxide matrix

Barite (Barium Sulfate (BaSO4)) — mineral

Barite

Barium Sulfate (BaSO4)

Chrysocolla and Azurite on Matrix (Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4 (Chrysocolla) and Copper carbonate hydroxide Cu3(CO3)2(OH)2 (Azurite)) — mineral

Chrysocolla and Azurite on Matrix

Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4 (Chrysocolla) and Copper carbonate hydroxide Cu3(CO3)2(OH)2 (Azurite)

Quartz Geode (Crystalline Silicon Dioxide (SiO2) in a Geodic structure) — mineral

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in a Geodic structure

Druzy Quartz (Crystalline Silicon Dioxide (SiO2)) — mineral

Druzy Quartz

Crystalline Silicon Dioxide (SiO2)

Pyrite in Shale (Iron Disulfide (FeS2) in Sedimentary Shale) — mineral

Pyrite in Shale

Iron Disulfide (FeS2) in Sedimentary Shale

Slag (Industrial Glass Slag) (Amorphous Silica / Ferro-silicate Slag) — mineraloid / anthropogenic

Slag (Industrial Glass Slag)

Amorphous Silica / Ferro-silicate Slag

mineraloid / anthropogenic

Limonite (Iron Ore) (Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)) — sedimentary

Limonite (Iron Ore)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Jasper and Quartz Breccia (Silicified Breccia (SiO2)) — sedimentary

Jasper and Quartz Breccia

Silicified Breccia (SiO2)

Chevron Amethyst (Silicon Dioxide with Iron Impurities (SiO2)) — mineral

Chevron Amethyst

Silicon Dioxide with Iron Impurities (SiO2)

Amethyst (Silicon Dioxide (SiO2), Quartz variety) — mineral

Amethyst

Silicon Dioxide (SiO2), Quartz variety

Likely gold-bearing quartz or iron-stained quartz specimen (Quartz (SiO₂), possibly with native gold (Au) or iron-oxide staining) — mineral

Likely gold-bearing quartz or iron-stained quartz specimen

Quartz (SiO₂), possibly with native gold (Au) or iron-oxide staining

Obsidian Arrowhead (Volcanic Glass (Primary composition: SiO2)) — igneous

Obsidian Arrowhead

Volcanic Glass (Primary composition: SiO2)

Blue-green fluorite crystal (Fluorite (calcium fluoride, CaF₂)) — mineral

Blue-green fluorite crystal

Fluorite (calcium fluoride, CaF₂)

Chalcedony (Agate/Carnelian-like) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate/Carnelian-like)

Silicon Dioxide (SiO2)

Amethyst Geode Segment (Silicon Dioxide (SiO2) with trace Iron impurities) — mineral

Amethyst Geode Segment

Silicon Dioxide (SiO2) with trace Iron impurities

Barite (Desert Diamond) (Barite (Barium Sulfate, BaSO4)) — mineral

Barite (Desert Diamond)

Barite (Barium Sulfate, BaSO4)

Quartz with Matrix (Silicon Dioxide (SiO2)) — mineral

Quartz with Matrix

Silicon Dioxide (SiO2)

Red Jasper (Silicon Dioxide (SiO2 with Hematite impurities)) — mineral

Red Jasper

Silicon Dioxide (SiO2 with Hematite impurities)

Polished orange calcite point (Calcite (CaCO₃), likely honey/orange calcite) — mineral

Polished orange calcite point

Calcite (CaCO₃), likely honey/orange calcite

Quartz Druze (Silicon Dioxide (SiO2)) — mineral

Quartz Druze

Silicon Dioxide (SiO2)

Green Calcite (Calcium Carbonate (CaCO3)) — mineral

Green Calcite

Calcium Carbonate (CaCO3)

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Blue Chalcedony (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony

Silicon Dioxide (SiO2)

Celestine (or Celestite) Geode (Strontium Sulfate (SrSO4)) — mineral

Celestine (or Celestite) Geode

Strontium Sulfate (SrSO4)

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

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Sandstone Concretion (Omar or Nut Rock) (Sedimentary Concretion (specifically an 'Omarolluk' or Omar)) — sedimentary

Sandstone Concretion (Omar or Nut Rock)

Sedimentary Concretion (specifically an 'Omarolluk' or Omar)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Yellow Jasper (Silicon Dioxide (SiO2) with Iron Oxides) — mineral

Yellow Jasper

Silicon Dioxide (SiO2) with Iron Oxides

Quartz Druzy (Quartz Druse) (Silicon Dioxide (SiO2)) — mineral

Quartz Druzy (Quartz Druse)

Silicon Dioxide (SiO2)

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

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Red Hematite (Iron(III) Oxide (Fe2O3)) — mineral

Red Hematite

Iron(III) Oxide (Fe2O3)

Ferruginous Quartz (Iron-stained Quartz) (Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions) — mineral

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Specular Hematite (Specularite) (Hematite (Alpha-Fe2O3)) — mineral

Specular Hematite (Specularite)

Hematite (Alpha-Fe2O3)

Copper (Native Copper (Cu)) — mineral

Copper

Native Copper (Cu)