Rock Identifier

Category

Sedimentary Rock (Specifically A Concretion Or Possibly A Geode)

Browse sedimentary rock (specifically a concretion or possibly a geode) specimens identified by the Rock Identifier community.

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

sedimentary
Chert (specifically tan/pink variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (specifically tan/pink variety)

Silicon Dioxide (SiO2)

sedimentary
Pebble (likely Sandstone or Granitic Pebble) (Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)) — Rock (likely Sedimentary)

Pebble (likely Sandstone or Granitic Pebble)

Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)

Rock (likely Sedimentary)
Carnelian Agate (Chalcedony (Silicon Dioxide, SiO2) with Iron Oxide impurities) — mineral

Carnelian Agate

Chalcedony (Silicon Dioxide, SiO2) with Iron Oxide impurities

mineral
Pink Granite (Phaneritic Felsic Igneous Rock) — igneous

Pink Granite

Phaneritic Felsic Igneous Rock

igneous
Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

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

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

sedimentary
Blue Quartzite (Quartzite (specifically a variety enriched with blue-coloring minerals)) — Metamorphic Rock

Blue Quartzite

Quartzite (specifically a variety enriched with blue-coloring minerals)

Metamorphic Rock
Unakite (Unakite (Epidotized Granite)) — metamorphic

Unakite

Unakite (Epidotized Granite)

metamorphic
Basalt (Basalt (composition predominately Plagioclase feldspar and Pyroxene)) — igneous

Basalt

Basalt (composition predominately Plagioclase feldspar and Pyroxene)

igneous
Greywacke (likely) (Greywacke (a type of sandstone)) — Sedimentary

Greywacke (likely)

Greywacke (a type of sandstone)

Sedimentary
Limestone (specifically fossiliferous/skeletal limestone) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (specifically fossiliferous/skeletal limestone)

Calcium Carbonate (CaCO3)

sedimentary
Dolomite or Limestone (Carbonate Rock) (CaMg(CO3)2 (Dolomite) or CaCO3 (Limestone / Calcite)) — sedimentary

Dolomite or Limestone (Carbonate Rock)

CaMg(CO3)2 (Dolomite) or CaCO3 (Limestone / Calcite)

sedimentary
Apache Tears (Obsidian) (Volcanic Glass (SiO2 - Silicon Dioxide with impurities)) — igneous

Apache Tears (Obsidian)

Volcanic Glass (SiO2 - Silicon Dioxide with impurities)

igneous
Quartz (beads) (SiO2 (Silicon Dioxide)) — Mineral

Quartz (beads)

SiO2 (Silicon Dioxide)

Mineral
Celestite (Celestine) (Strontium sulfate (SrSO4)) — mineral

Celestite (Celestine)

Strontium sulfate (SrSO4)

mineral
Granitic Gneiss (Gneiss (containing Potassium Feldspar and Quartz)) — metamorphic

Granitic Gneiss

Gneiss (containing Potassium Feldspar and Quartz)

metamorphic
N/A (This is a digital image of a bar graph) (Digital Data Visualization (Bar Chart)) — This is not a rock or mineral

N/A (This is a digital image of a bar graph)

Digital Data Visualization (Bar Chart)

This is not a rock or mineral
Carnelian (Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Carnelian (Chalcedony)

Silicon Dioxide (SiO2)

mineral
White Agate (resembling Bone Chalcedony) (Cryptocrystalline Quartz (SiO2)) — mineral

White Agate (resembling Bone Chalcedony)

Cryptocrystalline Quartz (SiO2)

mineral
Pink Granite (Phaneritic Felsic Igneous Plutonic Rock) — igneous

Pink Granite

Phaneritic Felsic Igneous Plutonic Rock

igneous
Amethyst Quartz (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst Quartz

Silicon Dioxide (SiO2) with iron impurities

mineral
Amethyst (Silicon dioxide with iron impurities (SiO2)) — mineral

Amethyst

Silicon dioxide with iron impurities (SiO2)

mineral
Purple Dyed Agate Geode (Banded Chalcedony) (Silicon Dioxide (SiO2) - variety: Agate) — mineral

Purple Dyed Agate Geode (Banded Chalcedony)

Silicon Dioxide (SiO2) - variety: Agate

mineral
Flower Agate (Plume Agate) (Chalcedony (Silicon Dioxide) with Spherulitic Inclusions - SiO2) — mineral

Flower Agate (Plume Agate)

Chalcedony (Silicon Dioxide) with Spherulitic Inclusions - SiO2

mineral
Greywhacke (River Pebble) (Graywacke (immature sandstone)) — sedimentary

Greywhacke (River Pebble)

Graywacke (immature sandstone)

sedimentary
Chert (specifically Green Chert/Jasper) (Silicon Dioxide (SiO2) - Cryptocrystalline Quartz) — sedimentary

Chert (specifically Green Chert/Jasper)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

sedimentary
Agate Geode / Thunderegg (Chalcedony (cryptocrystalline variety of Quartz), SiO2) — mineral

Agate Geode / Thunderegg

Chalcedony (cryptocrystalline variety of Quartz), SiO2

mineral
Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

mineral
Banded Gneiss (River Rock/Pebble) (Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)) — Metamorphic Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Metamorphic Rock
Amethyst (Crystalline Quartz (SiO2) with iron impurities) — mineral

Amethyst

Crystalline Quartz (SiO2) with iron impurities

mineral
Amethyst (Silicon Dioxide with iron impurities (SiO2)) — mineral

Amethyst

Silicon Dioxide with iron impurities (SiO2)

mineral
Ironstone Pebble (Ferruginous sedimentary rock (Fe2O3 / FeO(OH) mixed with SiO2)) — sedimentary

Ironstone Pebble

Ferruginous sedimentary rock (Fe2O3 / FeO(OH) mixed with SiO2)

sedimentary
Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

metamorphic
Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

metamorphic
Geode (Quartz chalcedony variety) (SiO2 (Silicon Dioxide)) — sedimentary

Geode (Quartz chalcedony variety)

SiO2 (Silicon Dioxide)

sedimentary
Gneiss (Granitic Gneiss) (Gneiss (from German Gneis, related to 'spark')) — metamorphic

Gneiss (Granitic Gneiss)

Gneiss (from German Gneis, related to 'spark')

metamorphic
Gneiss (Metamorphic Rock) (Gneiss (high-grade regional metamorphic rock)) — metamorphic

Gneiss (Metamorphic Rock)

Gneiss (high-grade regional metamorphic rock)

metamorphic
Gneiss (Gneiss (High-grade Metamorphic Rock)) — metamorphic

Gneiss

Gneiss (High-grade Metamorphic Rock)

metamorphic
Dyed Agate (Silicon Dioxide (SiO2) with artificial pigment) — mineral

Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

mineral
Stromatolite (Stromatolite (Cyanobacteria-formed Organo-sedimentary structure)) — sedimentary

Stromatolite

Stromatolite (Cyanobacteria-formed Organo-sedimentary structure)

sedimentary
Banded Gneiss (Gneiss (High-grade Regional Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

metamorphic