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

Goldstone (blue-goldstone–style glass) beads (Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral) — mineral

Goldstone (blue-goldstone–style glass) beads

Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Carnelian (Carnelian (variety of Chalcedony, SiO2)) — mineral

Carnelian

Carnelian (variety of Chalcedony, SiO2)

Blue Lace Agate (Banded Chalcedony) (Silicon Dioxide (SiO₂)) — mineral

Blue Lace Agate (Banded Chalcedony)

Silicon Dioxide (SiO₂)

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

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Unidentifiable Rock Fragment — Uncertain

Unidentifiable Rock Fragment

Quartz Geode Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode Pebble

Silicon Dioxide (SiO2)

Agate (specifically Waterline or Onyx-type Agate) (Silicon Dioxide (SiO2) - variety Chalcedony) — mineral

Agate (specifically Waterline or Onyx-type Agate)

Silicon Dioxide (SiO2) - variety Chalcedony

Quartz Vein Specimen (Silicon Dioxide (SiO2)) — mineral

Quartz Vein Specimen

Silicon Dioxide (SiO2)

Honey calcite cluster (Calcite (calcium carbonate, CaCO₃)) — mineral

Honey calcite cluster

Calcite (calcium carbonate, CaCO₃)

Sandstone with Manganese Dendrites (Arenite (mostly SiO2) with Manganese Oxide inclusions (MnO2)) — sedimentary

Sandstone with Manganese Dendrites

Arenite (mostly SiO2) with Manganese Oxide inclusions (MnO2)

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

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Quartz in Greenstone (Metamorphic rock with quartz vein (SiO2 / mixed silicates)) — metamorphic

Quartz in Greenstone

Metamorphic rock with quartz vein (SiO2 / mixed silicates)

Greywacke with Quartz Veins (Lithic Sandstone (Greywacke) with SiO2 inclusions) — sedimentary

Greywacke with Quartz Veins

Lithic Sandstone (Greywacke) with SiO2 inclusions

Dendritic Limestone (Calcite with Manganese Oxide (Manganese Dendrites)) — sedimentary

Dendritic Limestone

Calcite with Manganese Oxide (Manganese Dendrites)

Milky quartz (possibly chalcedony) (Quartz, SiO₂; likely massive or cryptocrystalline quartz) — mineral

Milky quartz (possibly chalcedony)

Quartz, SiO₂; likely massive or cryptocrystalline quartz

Selenite (gypsum crystal) (Gypsum, CaSO₄·2H₂O; variety selenite) — mineral

Selenite (gypsum crystal)

Gypsum, CaSO₄·2H₂O; variety selenite

Orange calcite (likely rough specimen) (Calcite, calcium carbonate (CaCO₃)) — mineral

Orange calcite (likely rough specimen)

Calcite, calcium carbonate (CaCO₃)

Amethyst Stalactite Slice (Crystalline Quartz (SiO2) with trace Iron (Fe4+)) — mineral

Amethyst Stalactite Slice

Crystalline Quartz (SiO2) with trace Iron (Fe4+)

Carnelian (Carnelian (Cryptocrystalline Quartz, SiO2)) — mineral

Carnelian

Carnelian (Cryptocrystalline Quartz, SiO2)

Red Agate (Agate (Cryptocrystalline variety of Quartz, SiO2)) — mineral

Red Agate

Agate (Cryptocrystalline variety of Quartz, SiO2)

Banded Agate (Dyed Purple) (Agate (Variety of Chalcedony/Quartz), SiO2) — mineral

Banded Agate (Dyed Purple)

Agate (Variety of Chalcedony/Quartz), SiO2

Orbicular Jasper (Ocean Jasper) (Silicon Dioxide (SiO2) with iron and magnesium inclusions) — mineral

Orbicular Jasper (Ocean Jasper)

Silicon Dioxide (SiO2) with iron and magnesium inclusions

Chert (Iron-stained) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Iron-stained)

Silicon Dioxide (SiO2)

Chert Nodule (Chert / Microcrystalline Quartz (SiO2)) — sedimentary

Chert Nodule

Chert / Microcrystalline Quartz (SiO2)

Onyx Marble (Banded Calcite) (Calcite (Calcium Carbonate, CaCO3)) — sedimentary

Onyx Marble (Banded Calcite)

Calcite (Calcium Carbonate, CaCO3)

Agate and Amethyst (Quartz variants) (Silicon Dioxide (SiO2) - Microcrystalline Quartz and Crystalline Quartz) — mineral

Agate and Amethyst (Quartz variants)

Silicon Dioxide (SiO2) - Microcrystalline Quartz and Crystalline Quartz

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

Celestite Geode

Celestine (Strontium Sulfate, SrSO4)

Amber in Matrix (Succinite (Carbon-based organic polymer)) — Organic (Sedimentary context)

Amber in Matrix

Succinite (Carbon-based organic polymer)

Organic (Sedimentary context)

Limonite (Hydrated Iron Oxide / Bog Iron) (FeO(OH)·nH2O) — Mineral (Sedimentary context)

Limonite (Hydrated Iron Oxide / Bog Iron)

FeO(OH)·nH2O

Mineral (Sedimentary context)

Honey calcite (yellow calcite) (Calcite, calcium carbonate (CaCO₃)) — mineral

Honey calcite (yellow calcite)

Calcite, calcium carbonate (CaCO₃)

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

Blue calcite (likely)

Calcite, calcium carbonate (CaCO₃)

Calcite crystal cluster (likely stalactitic or vein calcite) (Calcite, calcium carbonate (CaCO₃)) — mineral

Calcite crystal cluster (likely stalactitic or vein calcite)

Calcite, calcium carbonate (CaCO₃)

Quartz geode/druse specimen (Quartz, silicon dioxide (SiO₂), likely coating a weathered host rock) — mineral

Quartz geode/druse specimen

Quartz, silicon dioxide (SiO₂), likely coating a weathered host rock

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

Milky quartz crystal cluster

Quartz (silicon dioxide, SiO₂)

Honey calcite (orange calcite) (Calcite, calcium carbonate (CaCO₃)) — mineral

Honey calcite (orange calcite)

Calcite, calcium carbonate (CaCO₃)

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

Blue calcite cluster

Calcite (calcium carbonate, CaCO₃)

Blue calcite (probable) (Calcite — CaCO₃) — mineral

Blue calcite (probable)

Calcite — CaCO₃

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

Blue calcite (probable)

Calcite, calcium carbonate (CaCO₃)

Carnelian (Silicon Dioxide (SiO2) - variety of Chalcedony) — mineral

Carnelian

Silicon Dioxide (SiO2) - variety of Chalcedony

Desert Rose (Gypsum Variety) (Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O) — mineral

Desert Rose (Gypsum Variety)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O