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

Quartz-veined breccia (Hydrothermal quartz–carbonate breccia; chiefly SiO₂ quartz with calcite/dolomite and altered host rock) — metamorphic

Quartz-veined breccia

Hydrothermal quartz–carbonate breccia; chiefly SiO₂ quartz with calcite/dolomite and altered host rock

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

Amethyst

Quartz (Silicon Dioxide, SiO2)

Dendritic Jasper (SiO2 (Microcrystalline Quartz)) — mineral

Dendritic Jasper

SiO2 (Microcrystalline Quartz)

Raw selenite (gypsum) (Gypsum, CaSO₄·2H₂O; translucent variety selenite) — mineral

Raw selenite (gypsum)

Gypsum, CaSO₄·2H₂O; translucent variety selenite

Green fluorite crystal (Fluorite (calcium fluoride, CaF₂)) — mineral

Green fluorite crystal

Fluorite (calcium fluoride, CaF₂)

Milky quartz crystal cluster (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz crystal cluster

Quartz, silicon dioxide (SiO₂)

Tumbled yellow chalcedony or jasper pebble (Microcrystalline quartz (SiO₂), likely chalcedony with iron-oxide staining) — mineral

Tumbled yellow chalcedony or jasper pebble

Microcrystalline quartz (SiO₂), likely chalcedony with iron-oxide staining

Milky quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

Red Jasper (SiO2 (Silicon Dioxide with Iron Oxide inclusions)) — mineral

Red Jasper

SiO2 (Silicon Dioxide with Iron Oxide inclusions)

Gold Nugget (Gold (Au)) — mineral

Gold Nugget

Gold (Au)

Yellow Aventurine (Quartz variety (SiO2) with inclusions) — mineral

Yellow Aventurine

Quartz variety (SiO2) with inclusions

Quartz (Milky/Crystalline variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

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

Amethyst Geode

Amethyst (Silicon Dioxide, SiO2)

Hematite (Iron(III) oxide (Fe2O3)) — mineral

Hematite

Iron(III) oxide (Fe2O3)

Honey Calcite (Calcium Carbonate (CaCO3)) — mineral

Honey Calcite

Calcium Carbonate (CaCO3)

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

Quartz (Milky/Bull Quartz)

Silicon Dioxide (SiO2)

Carnelian (Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Carnelian (Chalcedony)

Silicon Dioxide (SiO2)

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

Milky Quartz Vein Rock

Silicon Dioxide (SiO2)

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

Amethyst Cluster

Silicon Dioxide (Quartz variety: Amethyst), SiO2

Milky quartz (quartz crystal) (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz (quartz crystal)

Quartz, silicon dioxide (SiO₂)

Red Jasper (Silicon Dioxide (SiO2) with Hematite inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Geode (unopened) or Calcareous Nodule (Siliceous or Calcareous Concretion/Nodule) — sedimentary

Geode (unopened) or Calcareous Nodule

Siliceous or Calcareous Concretion/Nodule

Banded Iron Formation (Fragment) (Banded Iron Formation (BIF)) — sedimentary

Banded Iron Formation (Fragment)

Banded Iron Formation (BIF)

Blue calcite (Calcite, CaCO₃) — mineral

Blue calcite

Calcite, CaCO₃

Amethyst (Quartz) (Silicon Dioxide (SiO2) with Iron impurities) — mineral

Amethyst (Quartz)

Silicon Dioxide (SiO2) with Iron impurities

Orange calcite pieces on blue calcite or aragonite matrix (Calcite, CaCO₃; blue coloration likely trace-element-bearing calcite (possibly aragonite)) — mineral

Orange calcite pieces on blue calcite or aragonite matrix

Calcite, CaCO₃; blue coloration likely trace-element-bearing calcite (possibly aragonite)

Hematite (Iron(III) oxide (Fe2O3)) — Mineral

Hematite

Iron(III) oxide (Fe2O3)

Yellow Jasper (Chert) (Silicon Dioxide (SiO2) with Iron Oxide impurities) — mineral

Yellow Jasper (Chert)

Silicon Dioxide (SiO2) with Iron Oxide impurities

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Heulandite with Stilbite (Heulandite-Ca ((Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O) and Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O)) — mineral

Heulandite with Stilbite

Heulandite-Ca ((Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O) and Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O)

Fluorite (often referred to casually as 'Fluorspar' in industrial contexts) (Fluorite (CaF2)) — Mineral

Fluorite (often referred to casually as 'Fluorspar' in industrial contexts)

Fluorite (CaF2)

Likely blue calcite (Calcite, CaCO₃) — mineral

Likely blue calcite

Calcite, CaCO₃

Quartz crystal cluster (Quartz, silicon dioxide (SiO₂), likely milky or inclusion-bearing quartz) — mineral

Quartz crystal cluster

Quartz, silicon dioxide (SiO₂), likely milky or inclusion-bearing quartz

Tumbled milky quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Galena (likely argentiferous galena) (Galena, PbS; commonly cubic or massive lead sulfide, sometimes containing silver) — mineral

Galena (likely argentiferous galena)

Galena, PbS; commonly cubic or massive lead sulfide, sometimes containing silver

Quartz-bearing sulfide ore, possibly pyrite in altered host rock (Likely pyrite (FeS₂) with quartz and possibly calcite or carbonate gangue; exact identification requires testing) — mineral

Quartz-bearing sulfide ore, possibly pyrite in altered host rock

Likely pyrite (FeS₂) with quartz and possibly calcite or carbonate gangue; exact identification requires testing

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

Milky Quartz Vein with Matrix

Silicon Dioxide (SiO2)

Gypsum crystal cluster (selenite/ satin-spar variety) (Gypsum — calcium sulfate dihydrate, CaSO₄·2H₂O) — mineral

Gypsum crystal cluster (selenite/ satin-spar variety)

Gypsum — calcium sulfate dihydrate, CaSO₄·2H₂O

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

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Banded Agate (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Banded Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Blue calcite (probable) (Calcite, calcium carbonate (CaCO₃)) — mineral

Blue calcite (probable)

Calcite, calcium carbonate (CaCO₃)