Rock Identifier

Category

Mineral Description (Anthropogenic Material)

Browse mineral description (anthropogenic material) specimens identified by the Rock Identifier community.

Learn about Mineral Description (Anthropogenic Material) in the encyclopedia

Peat

Glauconite

Hutcheonite

Halite

Sperrylite

Baddeleyite

Anatase

Brookite

Talc

Euxenite

Eltyubyuite

Buergerite

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Brecciated Jasper (Silicon Dioxide (SiO2) with iron impurities) — sedimentary

Brecciated Jasper

Silicon Dioxide (SiO2) with iron impurities

Sandstone (Sedimentary Rock (Quartz arenite)) — sedimentary

Sandstone

Sedimentary Rock (Quartz arenite)

Sandstone (likely Ferruginous) (Arenite with Iron Oxide cement) — sedimentary

Sandstone (likely Ferruginous)

Arenite with Iron Oxide cement

Pink quartz (likely rose quartz) (Quartz, silicon dioxide (SiO₂)) — mineral

Pink quartz (likely rose quartz)

Quartz, silicon dioxide (SiO₂)

Banded calcite (travertine/cave calcite) (Calcite, CaCO₃; likely banded carbonate travertine or flowstone) — mineral

Banded calcite (travertine/cave calcite)

Calcite, CaCO₃; likely banded carbonate travertine or flowstone

Rose Quartz (Silicon Dioxide (SiO2) with trace elements of titanium, iron, or manganese) — mineral

Rose Quartz

Silicon Dioxide (SiO2) with trace elements of titanium, iron, or manganese

Pyrite (Iron Disulfide (FeS2)) — mineral

Pyrite

Iron Disulfide (FeS2)

Chert (often called Flint or Jasper) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint or Jasper)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Coarse-grained Granite or Gneiss (Granitic intrusive rock) — igneous

Coarse-grained Granite or Gneiss

Granitic intrusive rock

Granodiorite (Phaneritic intrusive igneous rock) — igneous

Granodiorite

Phaneritic intrusive igneous rock

Quartz Pebble with Hematite Inclusion (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble with Hematite Inclusion

Silicon Dioxide (SiO2)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Red Sandstone (Ferruginous Sandstone) — sedimentary

Red Sandstone

Ferruginous Sandstone

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Sandstone (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily SiO2)

Banded Flint (Chert) (Silicon Dioxide (SiO2)) — sedimentary

Banded Flint (Chert)

Silicon Dioxide (SiO2)

Mixed Quartz and Jasper Pebbles (Silicon Dioxide (SiO2)) — Mineral

Mixed Quartz and Jasper Pebbles

Silicon Dioxide (SiO2)

Leopard Skin Jasper (Silicon Dioxide (SiO2) with mineral inclusions) — sedimentary

Leopard Skin Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Fossil Coral (Scleractinia (Fossilized Hexacoral)) — fossil

Fossil Coral

Scleractinia (Fossilized Hexacoral)

Petrified Wood (Silicified Wood (SiO2 permineralization)) — sedimentary

Petrified Wood

Silicified Wood (SiO2 permineralization)

Tiger’s-eye bead bracelet (Chatoyant quartz, principally quartz (SiO₂) with pseudomorphic fibrous crocidolite/goethite inclusions) — gemstone

Tiger’s-eye bead bracelet

Chatoyant quartz, principally quartz (SiO₂) with pseudomorphic fibrous crocidolite/goethite inclusions

Rhodochrosite (Manganese carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese carbonate (MnCO3)

Quartz-rich pegmatitic rock (likely quartz–feldspar–mica specimen) (Granitic pegmatite; mainly quartz (SiO₂), feldspar, and dark mica/amphibole) — igneous

Quartz-rich pegmatitic rock (likely quartz–feldspar–mica specimen)

Granitic pegmatite; mainly quartz (SiO₂), feldspar, and dark mica/amphibole

Quartz-rich gravel fragment (Quartz (silicon dioxide, SiO₂), possibly with feldspar or carbonate inclusions) — mineral

Quartz-rich gravel fragment

Quartz (silicon dioxide, SiO₂), possibly with feldspar or carbonate inclusions

Green aventurine (likely) (Quartzite dominated by quartz (SiO₂), colored green by fuchsite mica or chlorite) — mineral

Green aventurine (likely)

Quartzite dominated by quartz (SiO₂), colored green by fuchsite mica or chlorite

Petrified Wood (Silicified wood (primarily SiO2 - Silicon Dioxide)) — mineral

Petrified Wood

Silicified wood (primarily SiO2 - Silicon Dioxide)

Chalcedony (Botryoidal or Tumbled) (Chalcedony (SiO₂)) — mineral

Chalcedony (Botryoidal or Tumbled)

Chalcedony (SiO₂)

Tuff with Quartz and Calcite Veining (Lithic Tuff (Silicified)) — igneous

Tuff with Quartz and Calcite Veining

Lithic Tuff (Silicified)

Quartz pebble (Silicon Dioxide (SiO2)) — mineral

Quartz pebble

Silicon Dioxide (SiO2)

Botryoidal chalcedony (possibly agate/geode material) (Microcrystalline quartz, SiO₂; commonly chalcedony with quartz-lined cavities and iron-oxide staining) — mineral

Botryoidal chalcedony (possibly agate/geode material)

Microcrystalline quartz, SiO₂; commonly chalcedony with quartz-lined cavities and iron-oxide staining

Quartz and Slate Pebbles (Silicon Dioxide (SiO2) and Metamorphosed Shale/Mudstone) — mineral

Quartz and Slate Pebbles

Silicon Dioxide (SiO2) and Metamorphosed Shale/Mudstone

Amber (Succinite (C10H16O)) — mineral

Amber

Succinite (C10H16O)

Sandstone (Ferruginous) (Arenite (Fe-oxide cemented)) — sedimentary

Sandstone (Ferruginous)

Arenite (Fe-oxide cemented)

Amethyst geode (Quartz (SiO₂), purple variety amethyst; commonly in basalt-hosted geodes) — mineral

Amethyst geode

Quartz (SiO₂), purple variety amethyst; commonly in basalt-hosted geodes

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

Orange chalcedony or weathered quartz pebble (Microcrystalline quartz, SiO₂; possibly iron-oxide-stained chalcedony) — mineral

Orange chalcedony or weathered quartz pebble

Microcrystalline quartz, SiO₂; possibly iron-oxide-stained chalcedony

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

Blue Lace Agate

Silicon Dioxide (SiO2)

Diamond (set in jewelry) (Diamond (Carbon, C)) — mineral

Diamond (set in jewelry)

Diamond (Carbon, C)

Ruby (Raw Corundum) (Corundum (Al2O3 with Chromium impurities)) — mineral

Ruby (Raw Corundum)

Corundum (Al2O3 with Chromium impurities)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)