Rock Identifier

Category

Mineral, Specifically A Rock Fragment

Browse mineral, specifically a rock fragment specimens identified by the Rock Identifier community.

Learn about Mineral, Specifically A Rock Fragment in the encyclopedia

Rock Salt

Rock Gypsum

Coral Rock

Asphalt Rock

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Lithic Sandstone

Lithic Sandstone

Halite

Coquina

Dolomite

Gypsum

Breccia

Chert Breccia (Brecciated Chert) — sedimentary

Chert Breccia

Brecciated Chert

Sandstone (Clastic sedimentary rock) — sedimentary

Sandstone

Clastic sedimentary rock

Sandstone (Weathered Pebble) (Sedimentary Rock (Quartz arenite)) — sedimentary

Sandstone (Weathered Pebble)

Sedimentary Rock (Quartz arenite)

Ironstone Concretion (Moqui Marble) (Iron-oxide Concretion (Hydrated ferric oxide, Fe2O3·nH2O)) — sedimentary

Ironstone Concretion (Moqui Marble)

Iron-oxide Concretion (Hydrated ferric oxide, Fe2O3·nH2O)

Likely weathered brown rock fragment (Indeterminate; possibly iron-oxide-stained sandstone or laterite) — sedimentary

Likely weathered brown rock fragment

Indeterminate; possibly iron-oxide-stained sandstone or laterite

Dark gray-blue stone fragment (Unidentified fine-grained rock; the image is insufficient for a reliable species-level identification) — igneous

Dark gray-blue stone fragment

Unidentified fine-grained rock; the image is insufficient for a reliable species-level identification

Pink Granite (Granite (Felsic intrusive igneous rock)) — igneous

Pink Granite

Granite (Felsic intrusive igneous rock)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Sandstone (Arenite (Quartz Sandstone)) — sedimentary

Sandstone

Arenite (Quartz Sandstone)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Weathered Sandstone (Quartz Arenite / Clastic Sedimentary Rock) — sedimentary

Weathered Sandstone

Quartz Arenite / Clastic Sedimentary Rock

Sandstone (Weathered / Crushed) (Quartz Sandstone) — sedimentary

Sandstone (Weathered / Crushed)

Quartz Sandstone

Sandstone Pebble (Sedimentary Rock (Quartzose Sandstone)) — sedimentary

Sandstone Pebble

Sedimentary Rock (Quartzose Sandstone)

Sandstone (Arenite (composed mainly of SiO2)) — sedimentary

Sandstone

Arenite (composed mainly of SiO2)

Sandstone (Sandstone (Sedimentary rock composed of silicate grains)) — sedimentary

Sandstone

Sandstone (Sedimentary rock composed of silicate grains)

Sandstone (Arenite (SiO2 predominantly)) — sedimentary

Sandstone

Arenite (SiO2 predominantly)

Moss-covered Rock Fragment (Weathered Rock Fragment with Epilithic Growth) — sedimentary

Moss-covered Rock Fragment

Weathered Rock Fragment with Epilithic Growth

Clear quartz (rock crystal) (Quartz, silicon dioxide (SiO₂)) — mineral

Clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

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

Greywacke (likely)

Greywacke (a type of sandstone)

Sandstone (Wonderstone) (Clastic Sedimentary Rock (primarily SiO2)) — sedimentary

Sandstone (Wonderstone)

Clastic Sedimentary Rock (primarily SiO2)

Weathered conglomeratic breccia (Polymictic conglomerate/breccia, likely iron-stained) — sedimentary

Weathered conglomeratic breccia

Polymictic conglomerate/breccia, likely iron-stained

Banded Gneiss (River Rock/Pebble) (Gneiss (specifically a banded variety often found as a river rock)) — Metamorphic Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Quartz (Rose or Milky) (Silicon Dioxide (SiO2)) — mineral

Quartz (Rose or Milky)

Silicon Dioxide (SiO2)

Small shell fragment (likely gastropod or bivalve fossil) (Fossilized calcium-carbonate shell; chiefly aragonite or calcite (CaCO₃)) — fossil

Small shell fragment (likely gastropod or bivalve fossil)

Fossilized calcium-carbonate shell; chiefly aragonite or calcite (CaCO₃)

Quartz / Quartzite (Silicon Dioxide (SiO2)) — mineral

Quartz / Quartzite

Silicon Dioxide (SiO2)

Granite fragment (Granite, chiefly quartz (SiO₂), feldspar, and mica) — igneous

Granite fragment

Granite, chiefly quartz (SiO₂), feldspar, and mica

Weathered quartz-rich rock fragment (Likely quartz-bearing feldspathic fragment; exact identification requires testing) — mineral

Weathered quartz-rich rock fragment

Likely quartz-bearing feldspathic fragment; exact identification requires testing

Likely quartz-rich rock fragment (Indeterminate; probably microcrystalline quartz (SiO₂) with minor feldspar or weathering minerals) — mineral

Likely quartz-rich rock fragment

Indeterminate; probably microcrystalline quartz (SiO₂) with minor feldspar or weathering minerals

Likely granite (Granite, a coarse-grained felsic intrusive igneous rock) — igneous

Likely granite

Granite, a coarse-grained felsic intrusive igneous rock

Ocean Jasper (Silicon Dioxide (SiO2) with various inclusions) — Mineral (Variety of Quartz)

Ocean Jasper

Silicon Dioxide (SiO2) with various inclusions

Mineral (Variety of Quartz)

Concrete Fragment (Hardened Portland Cement Composite) — Anthropogenic (Man-made material mimicking sedimentary rock)

Concrete Fragment

Hardened Portland Cement Composite

Anthropogenic (Man-made material mimicking sedimentary rock)

Small brown mineral specimen, possibly mica-bearing rock (Unidentified from the image; exact mineral species cannot be determined at this scale) — mineral

Small brown mineral specimen, possibly mica-bearing rock

Unidentified from the image; exact mineral species cannot be determined at this scale

Pink Granite (River Pebble) (Phaneritic Felsic Igneous Rock) — igneous

Pink Granite (River Pebble)

Phaneritic Felsic Igneous Rock

Pink Granite (Phaneritic Felsic Igneous Rock) — igneous

Pink Granite

Phaneritic Felsic Igneous Rock

Pink Granite (Granite (Felsic Plutonic Rock)) — igneous

Pink Granite

Granite (Felsic Plutonic Rock)

Granite Water-Worn Pebble (Phaneritic Felsic Igneous Rock) — igneous

Granite Water-Worn Pebble

Phaneritic Felsic Igneous Rock

Feldspar-rich Granite (Pink Granite) (Phaneritic Felsic Igneous Rock) — igneous

Feldspar-rich Granite (Pink Granite)

Phaneritic Felsic Igneous Rock

Pink Granite (Granite (Felsic plutonic rock)) — igneous

Pink Granite

Granite (Felsic plutonic rock)

Weathered quartz-rich pebble (Likely granitic or feldspathic clast; chiefly quartz (SiO₂) and feldspar) — igneous

Weathered quartz-rich pebble

Likely granitic or feldspathic clast; chiefly quartz (SiO₂) and feldspar