Rock Identifier

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This Is Not A Rock Or Mineral

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Claystone

Shale

Rock Salt

Rock Gypsum

Coral Rock

Asphalt Rock

Calc-Silicate Rock

Calc-Silicate Rock

Albite

Talc-carbonate Rock

Talc-carbonate Rock

Potassium Feldspar

Potassium Feldspar

Halite

Dolomite

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

Quartz (Clear/Smoky Geode fragment)

Silicon Dioxide (SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Granite (Intrusive Igneous Rock (composed primarily of quartz, alkali feldspar, and plagioclase)) — igneous

Granite

Intrusive Igneous Rock (composed primarily of quartz, alkali feldspar, and plagioclase)

Gossan (with Limonite/Hematite coating) (Ferruginous Gossan (Fe2O3·nH2O / Fe2O3)) — sedimentary

Gossan (with Limonite/Hematite coating)

Ferruginous Gossan (Fe2O3·nH2O / Fe2O3)

Greenish metamorphic rock (possibly chlorite schist) (Chlorite-rich schist; exact identification is uncertain from the image) — metamorphic

Greenish metamorphic rock (possibly chlorite schist)

Chlorite-rich schist; exact identification is uncertain from the image

Quartz-Veined Slate or Greenstone (Metamorphic rock with quartz vein (SiO2)) — metamorphic

Quartz-Veined Slate or Greenstone

Metamorphic rock with quartz vein (SiO2)

Unidentified dark mineral/rock fragment (Indeterminate; appearance may fit a sulfide-bearing rock or iron-rich mineral) — mineral

Unidentified dark mineral/rock fragment

Indeterminate; appearance may fit a sulfide-bearing rock or iron-rich mineral

Granite Pebble with Quartz Vein (Granite (Plutonic Igneous Rock) with Quartz (SiO2)) — igneous

Granite Pebble with Quartz Vein

Granite (Plutonic Igneous Rock) with Quartz (SiO2)

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

Quartz Geode

Quartz (Silicon Dioxide, SiO2)

Quartzite Pebble (Quartzite (mostly SiO2)) — metamorphic

Quartzite Pebble

Quartzite (mostly SiO2)

Milky Quartz with Chlorite Schist Inclusions (Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)) — metamorphic

Milky Quartz with Chlorite Schist Inclusions

Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)

River Stone (likely Basalt or Greywacke) (Basalt with mineral veining) — igneous

River Stone (likely Basalt or Greywacke)

Basalt with mineral veining

Likely bituminous coal (Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image) — sedimentary

Likely bituminous coal

Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image

Geode (Quartz / Chalcedony nodule) — sedimentary

Geode

Quartz / Chalcedony nodule

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)

Xenolith in Basalt (Mafic Igneous Rock with Felsic Inclusion) — igneous

Xenolith in Basalt

Mafic Igneous Rock with Felsic Inclusion

Banded gneiss pebble (Gneiss, commonly quartz–feldspar–mica gneiss) — metamorphic

Banded gneiss pebble

Gneiss, commonly quartz–feldspar–mica gneiss

Wishing Stone (Quartz Vein in Greywacke / Basalt) (Quartz vein in host rock (e.g. Meta-basalt or Greywacke)) — metamorphic

Wishing Stone (Quartz Vein in Greywacke / Basalt)

Quartz vein in host rock (e.g. Meta-basalt or Greywacke)

Granite Pebble (Pegmatitic Quartz-Feldspar River Rock) (Granite / Quartz-Feldspar-Mica Aggregate) — igneous

Granite Pebble (Pegmatitic Quartz-Feldspar River Rock)

Granite / Quartz-Feldspar-Mica Aggregate

Schist (likely Mica Schist) (Mica Schist) — metamorphic

Schist (likely Mica Schist)

Mica Schist

Geode Nodule Fragment (Quartz / Chalcedony Nodule) — sedimentary

Geode Nodule Fragment

Quartz / Chalcedony Nodule

Dark igneous rock, likely basalt or diabase, with a second purplish specimen (Basalt/diabase; exact identification is uncertain from the photograph) — igneous

Dark igneous rock, likely basalt or diabase, with a second purplish specimen

Basalt/diabase; exact identification is uncertain from the photograph

Generic Pebble (Lithic Fragment) — sedimentary

Generic Pebble

Lithic Fragment

Granite (Intrusive Igneous Rock (composed mainly of quartz, alkali feldspar, and plagioclase)) — igneous

Granite

Intrusive Igneous Rock (composed mainly of quartz, alkali feldspar, and plagioclase)

Red Sandstone (Arenite (primarily quartz with iron oxide cement)) — sedimentary

Red Sandstone

Arenite (primarily quartz with iron oxide cement)

Chalcopyrite (Copper Iron Sulfide (CuFeS2)) — mineral

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Sandstone with Lichen and Iron Oxide Staining (Quartz Arenite / Sandstone) — sedimentary

Sandstone with Lichen and Iron Oxide Staining

Quartz Arenite / Sandstone

Unidentified rock fragments (Indeterminate; likely a weathered, iron-stained silicate rock) — mineral

Unidentified rock fragments

Indeterminate; likely a weathered, iron-stained silicate rock

Granite (Intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase) — igneous

Granite

Intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase

Sandstone (with Iron Staining) (Arenite (primarily SiO2 with Fe2O3/FeO(OH) oxides)) — sedimentary

Sandstone (with Iron Staining)

Arenite (primarily SiO2 with Fe2O3/FeO(OH) oxides)

Sandstone (Micaceous) (Clastic Sedimentary Rock (primarily SiO2 with Mica)) — sedimentary

Sandstone (Micaceous)

Clastic Sedimentary Rock (primarily SiO2 with Mica)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Gravel and Sediment Sample (Mixed clastic sediment) — sedimentary

Gravel and Sediment Sample

Mixed clastic sediment

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Pink granite (Granite, chiefly quartz, potassium feldspar, and plagioclase with minor mica) — igneous

Pink granite

Granite, chiefly quartz, potassium feldspar, and plagioclase with minor mica

Sandstone (Iron-stained) (Arenite with Limonite/Hematite staining) — sedimentary

Sandstone (Iron-stained)

Arenite with Limonite/Hematite staining

Gravel (Unconsolidated rock fragments / detrital sediment) — sedimentary

Gravel

Unconsolidated rock fragments / detrital sediment

Fossilized Brachiopod or Gastropod in Chert/Limestone (Phylum Brachiopoda / Mollusca) — fossil

Fossilized Brachiopod or Gastropod in Chert/Limestone

Phylum Brachiopoda / Mollusca

Vesicular Basalt (Lava Rock) (Vesicular Basalt) — igneous

Vesicular Basalt (Lava Rock)

Vesicular Basalt

Serpentine (Antigorite, Lizardite, or Chrysotile (Mg3Si2O5(OH)4)) — metamorphic

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg3Si2O5(OH)4)

Weathered, rounded rock (likely metamorphic or igneous) (Undetermined; possibly a quartz- and feldspar-bearing rock) — metamorphic

Weathered, rounded rock (likely metamorphic or igneous)

Undetermined; possibly a quartz- and feldspar-bearing rock

Likely gneiss (banded metamorphic rock) (Felsic-to-intermediate gneiss; exact mineral identification requires closer examination) — metamorphic

Likely gneiss (banded metamorphic rock)

Felsic-to-intermediate gneiss; exact mineral identification requires closer examination