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

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

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Basalt with Vesicle/Vug (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt with Vesicle/Vug

Basalt (Aphanitic Mafic Igneous Rock)

Possible fossil-bearing pebble (Unidentified fine-grained sedimentary rock; the small orange feature may be a fossil or mineral inclusion) — sedimentary

Possible fossil-bearing pebble

Unidentified fine-grained sedimentary rock; the small orange feature may be a fossil or mineral inclusion

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Banded Gneiss (Gneiss (High-grade regional metamorphic rock)) — metamorphic

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Fossilized Echinoid Fragment (Calycinal/Boss Fossil) (Echinodermata fossil fragment) — fossil

Fossilized Echinoid Fragment (Calycinal/Boss Fossil)

Echinodermata fossil fragment

Sandstone (Sedimentary Rock (Quartz arenite/Arkose)) — sedimentary

Sandstone

Sedimentary Rock (Quartz arenite/Arkose)

Unidentified weathered rock fragments (Likely mixed quartz- and feldspar-bearing silicate material; exact identification requires testing) — mineral

Unidentified weathered rock fragments

Likely mixed quartz- and feldspar-bearing silicate material; exact identification requires testing

Almandine Garnet (Almandine (Fe3Al2(SiO4)3)) — mineral

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Agate (Grey Agate Slice) (Microcrystalline Quartz (SiO2)) — mineral

Agate (Grey Agate Slice)

Microcrystalline Quartz (SiO2)

Dalmatian Jasper (Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite) — igneous

Dalmatian Jasper

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

Kimberlite (Ultramafic igneous rock) — igneous

Kimberlite

Ultramafic igneous rock

Fossiliferous Limestone (Crinoidal) (Calcite-bearing bioclastic packstone (CaCO3)) — sedimentary

Fossiliferous Limestone (Crinoidal)

Calcite-bearing bioclastic packstone (CaCO3)

Unidentifiable Rock Fragment — Uncertain

Unidentifiable Rock Fragment

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Sandstone (Arenite (SiO2 predominantly)) — sedimentary

Sandstone

Arenite (SiO2 predominantly)

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

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Travertine (Tufa) (Chemical Limestone (CaCO3)) — sedimentary

Travertine (Tufa)

Chemical Limestone (CaCO3)

Polished Basalt (Basalt (Mafic volcanic rock)) — Igneous

Polished Basalt

Basalt (Mafic volcanic rock)

Quartz Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz Fragment

Silicon Dioxide (SiO2)

Generic Pebble / Small Rock Fragment (Lithic fragment / Weathered rock particle) — sedimentary

Generic Pebble / Small Rock Fragment

Lithic fragment / Weathered rock particle

Sandstone (Arenite (SiO2 dominant)) — sedimentary

Sandstone

Arenite (SiO2 dominant)

Iron-stained brown mineral/rock fragment (Most likely limonite/goethite-rich material (hydrated iron oxides), possibly weathered ironstone; exact identification requires testing) — mineral

Iron-stained brown mineral/rock fragment

Most likely limonite/goethite-rich material (hydrated iron oxides), possibly weathered ironstone; exact identification requires testing

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Druzy quartz fragment (Quartz, SiO₂, with a coating of tiny quartz crystals) — mineral

Druzy quartz fragment

Quartz, SiO₂, with a coating of tiny quartz crystals

Likely weathered sandstone or iron-stained sedimentary pebble (Indeterminate clastic sedimentary rock; possibly quartz-rich sandstone) — sedimentary

Likely weathered sandstone or iron-stained sedimentary pebble

Indeterminate clastic sedimentary rock; possibly quartz-rich sandstone

Basalt with Amygdaloidal Inclusions (Aphanitic Mafic Volcanic Rock (Basalt)) — igneous

Basalt with Amygdaloidal Inclusions

Aphanitic Mafic Volcanic Rock (Basalt)

Agate (Carnelian / Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Agate (Carnelian / Chalcedony)

Silicon Dioxide (SiO2)

Pink Granite (Granite (enriched in Potassium Feldspar)) — igneous

Pink Granite

Granite (enriched in Potassium Feldspar)

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Serpentine (Antigorite/Lizardite (Mg,Fe)3Si2O5(OH)4) — metamorphic

Serpentine

Antigorite/Lizardite (Mg,Fe)3Si2O5(OH)4

Unknown dark mineral fragment (Indeterminate; possibly a dark silicate mineral or slag-like geological fragment) — mineral

Unknown dark mineral fragment

Indeterminate; possibly a dark silicate mineral or slag-like geological fragment

Quartz pebble in concrete (Quartz (SiO₂), embedded in Portland-cement concrete) — mineral

Quartz pebble in concrete

Quartz (SiO₂), embedded in Portland-cement concrete

Emerald in Matrix (Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities) — mineral

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

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

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

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

Quartz (Gravel Fragment)

Silicon Dioxide (SiO2)

Gravel and Sediment Sample (Mixed clastic sediment) — sedimentary

Gravel and Sediment Sample

Mixed clastic sediment

Small quartz-rich rock fragment (Likely quartz (SiO₂), possibly a pale granite or feldspar-bearing fragment) — mineral

Small quartz-rich rock fragment

Likely quartz (SiO₂), possibly a pale granite or feldspar-bearing fragment

Quartz vein fragment (Quartz (SiO₂), likely milky quartz with iron-oxide staining) — mineral

Quartz vein fragment

Quartz (SiO₂), likely milky quartz with iron-oxide staining

Common Brown Pebble (Weathered Rock Fragment) — sedimentary

Common Brown Pebble

Weathered Rock Fragment

Gravel / Small Pebble (Rock Fragment (Gravel)) — sedimentary

Gravel / Small Pebble

Rock Fragment (Gravel)

River Pebble (Siliceous rock fragment) — sedimentary

River Pebble

Siliceous rock fragment