Rock Identifier

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Browse this image does not display a rock, mineral, or geological specimen. it shows a human hand wearing a ring. specimens identified by the Rock Identifier community.

Chert Nodule (River Cobble) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert Nodule (River Cobble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Anthracite Coal (Coal (predominantly carbon)) — sedimentary

Anthracite Coal

Coal (predominantly carbon)

Agate (Chalcedony (Silicon Dioxide, SiO2)) — mineral

Agate

Chalcedony (Silicon Dioxide, SiO2)

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

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Quartz Crystal with Inclusions (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal with Inclusions

Silicon Dioxide (SiO2)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Chert / Flint (Chert (varietal name for microcrystalline quartz). Chemical formula: SiO₂) — Mineral

Chert / Flint

Chert (varietal name for microcrystalline quartz). Chemical formula: SiO₂

Asphalt Concrete (Bituminous Conglomerate) (Anthropogenic Bituminous Conglomerate) — sedimentary

Asphalt Concrete (Bituminous Conglomerate)

Anthropogenic Bituminous Conglomerate

Marble (Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)) — Metamorphic Rock

Marble

Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)

Metamorphic Rock

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

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Carnelian (Carnelian (a variety of Chalcedony, SiO2)) — Mineral

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Cinnabar in Quartz (Silicon Dioxide (Quartz, SiO2) with Mercury Sulfide inclusions (Cinnabar, HgS)) — mineral

Cinnabar in Quartz

Silicon Dioxide (Quartz, SiO2) with Mercury Sulfide inclusions (Cinnabar, HgS)

Chert (with Iron Staining) (Silicon Dioxide (SiO2)) — sedimentary

Chert (with Iron Staining)

Silicon Dioxide (SiO2)

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

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Carnelian (Carnelian (a variety of Chalcedony) - SiO2) — mineral

Carnelian

Carnelian (a variety of Chalcedony) - SiO2

Anthracite Coal (Anthracite) — metamorphic

Anthracite Coal

Anthracite

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

Amethyst (Faceted)

Silicon Dioxide with Iron impurities (SiO2)

Sandstone (Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Jasper pebble (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Jasper pebble

Jasper (Silicon Dioxide, SiO2)

Fluorite (Fluorite (Calcium Fluoride - CaF2)) — mineral

Fluorite

Fluorite (Calcium Fluoride - CaF2)

Chert / Flint (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Dendritic Opal (Merlinite) (Hydrated Silica with Manganese/Iron oxide inclusions (SiO2·nH2O)) — mineral

Dendritic Opal (Merlinite)

Hydrated Silica with Manganese/Iron oxide inclusions (SiO2·nH2O)

Granitic Pegmatite (Granite (with coarse-grained Quartz, Feldspar, and Mica components)) — igneous

Granitic Pegmatite

Granite (with coarse-grained Quartz, Feldspar, and Mica components)

Sandstone (Water-worn Pebble) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (Water-worn Pebble)

Clastic sedimentary rock (primarily SiO2)

Orange Quartzite / River Pebble (Quartzite (primarily SiO2)) — metamorphic

Orange Quartzite / River Pebble

Quartzite (primarily SiO2)

Sandstone (Quartzite Pebble) (Arenite (SiO2)) — sedimentary

Sandstone (Quartzite Pebble)

Arenite (SiO2)

Yellow Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Sandstone (Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Moss Agate (Silicon Dioxide with inclusions (SiO2 + impurities)) — mineral

Moss Agate

Silicon Dioxide with inclusions (SiO2 + impurities)

Red Chalcedony (likely dyed) (Chalcedony (a variety of Quartz), SiO2) — Mineral (Cryptocrystalline Quartz)

Red Chalcedony (likely dyed)

Chalcedony (a variety of Quartz), SiO2

Mineral (Cryptocrystalline Quartz)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Basalt Pebble (Basalt (Extrusive Mafic Igneous)) — igneous

Basalt Pebble

Basalt (Extrusive Mafic Igneous)

Lapis Lazuli (Lapis lazuli (a metamorphic rock primarily composed of Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)) — metamorphic

Lapis Lazuli

Lapis lazuli (a metamorphic rock primarily composed of Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Peridot (Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)) — mineral

Peridot

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

Banded Iron Formation (BIF) (Banded Iron Formation (SiO2 + Fe2O3/Fe3O4)) — sedimentary

Banded Iron Formation (BIF)

Banded Iron Formation (SiO2 + Fe2O3/Fe3O4)

Chert (often called Flint when dark) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Moss Agate (Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide) — mineral

Moss Agate

Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide

Chalcedony (Agate/Blue Quartzite) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate/Blue Quartzite)

Silicon Dioxide (SiO2)

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Sandstone (Weathered Pebble) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Weathered Pebble)

Arenite (primarily SiO2)

Fluorite (Rainbow Fluorite) (Calcium Fluoride (CaF2)) — Mineral

Fluorite (Rainbow Fluorite)

Calcium Fluoride (CaF2)