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

Rutilated Quartz (Quartz (SiO2) with Rutile (TiO2) inclusions) — Mineral

Rutilated Quartz

Quartz (SiO2) with Rutile (TiO2) inclusions

Quartz fragment (Silicon Dioxide (SiO2)) — mineral

Quartz fragment

Silicon Dioxide (SiO2)

Obsidian arrowhead flakes (Volcanic glass; primarily silica-rich rhyolitic composition (approximately 70–75% SiO₂)) — igneous

Obsidian arrowhead flakes

Volcanic glass; primarily silica-rich rhyolitic composition (approximately 70–75% SiO₂)

Blue calcite (Calcite (CaCO₃), likely blue calcite with minor matrix minerals) — mineral

Blue calcite

Calcite (CaCO₃), likely blue calcite with minor matrix minerals

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

Quartz in Greenstone

Metamorphic rock with quartz vein (SiO2 / mixed silicates)

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

Green fluorite crystal

Fluorite (calcium fluoride, CaF₂)

Desert Rose (Gypsum (variety Selenite) - CaSO4·2H2O) — mineral

Desert Rose

Gypsum (variety Selenite) - CaSO4·2H2O

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

Amethyst Geodes

Silicon Dioxide (Quartz with Iron impurities), SiO2

Tumbled blue calcite (Calcite (CaCO₃), likely blue variety) — mineral

Tumbled blue calcite

Calcite (CaCO₃), likely blue variety

Tumbled milky quartz (likely chalcedony or quartzite) (Quartz/chalcedony, silicon dioxide (SiO₂)) — mineral

Tumbled milky quartz (likely chalcedony or quartzite)

Quartz/chalcedony, silicon dioxide (SiO₂)

Tumbled Yellow Chalcedony / Iron-Stained Quartz (Silicon Dioxide (SiO2)) — mineral

Tumbled Yellow Chalcedony / Iron-Stained Quartz

Silicon Dioxide (SiO2)

Celestite (Celestine) Druze on Agate/Host Rock (Strontium sulfate (SrSO4)) — mineral

Celestite (Celestine) Druze on Agate/Host Rock

Strontium sulfate (SrSO4)

Satin Spar (often marketed as Selenite) (Fibrous Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O) — mineral

Satin Spar (often marketed as Selenite)

Fibrous Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Milky or Iron-Stained Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky or Iron-Stained Quartz

Quartz (Silicon Dioxide, SiO2)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

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

Amethyst

Amethyst (Silicon Dioxide, SiO2)

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

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Agate (specifically Lace Agate or Banded Agate) (Silicon Dioxide (SiO2)) — mineral

Agate (specifically Lace Agate or Banded Agate)

Silicon Dioxide (SiO2)

Tumbled fluorite (probable) (Fluorite, calcium fluoride (CaF₂)) — mineral

Tumbled fluorite (probable)

Fluorite, calcium fluoride (CaF₂)

Red calcite (Calcite (CaCO₃), likely iron- or manganese-colored) — mineral

Red calcite

Calcite (CaCO₃), likely iron- or manganese-colored

Green Agate (Cryptocrystalline Quartz (SiO2)) — mineral

Green Agate

Cryptocrystalline Quartz (SiO2)

Chalcedony (specifically Agate or Flint) (Silicon Dioxide (SiO₂)) — Mineral

Chalcedony (specifically Agate or Flint)

Silicon Dioxide (SiO₂)

Quartz (Clear/Smoky Geode fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz (Clear/Smoky Geode fragment)

Silicon Dioxide (SiO2)

Jasper (Silicon Dioxide (SiO2)) — sedimentary

Jasper

Silicon Dioxide (SiO2)

Chert (Flint Nodule) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Flint Nodule)

Microcrystalline quartz (SiO2)

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)

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

Milky quartz (rough quartz specimen)

Quartz, silicon dioxide (SiO₂)

Desert Rose (Gypsum rosette (CaSO4·2H2O) or Barite rosette (BaSO4)) — mineral

Desert Rose

Gypsum rosette (CaSO4·2H2O) or Barite rosette (BaSO4)

Chert with Quartz Veining (Microcrystalline Silica (SiO2)) — sedimentary

Chert with Quartz Veining

Microcrystalline Silica (SiO2)

Rough Quartz Crystal in Matrix (Silicon Dioxide (SiO2)) — mineral

Rough Quartz Crystal in Matrix

Silicon Dioxide (SiO2)

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

Honey calcite cluster

Calcite (calcium carbonate, CaCO₃)

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

Honey calcite (orange calcite)

Calcite, calcium carbonate (CaCO₃)

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

Goldstone (Avventurina (Man-made Glass with Copper inclusions)) — mineral

Goldstone

Avventurina (Man-made Glass with Copper inclusions)

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)

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)