Rock Identifier

Category

Mineral, Often A Rock Given Its Aggregate Nature

Browse mineral, often a rock given its aggregate nature specimens identified by the Rock Identifier community.

Sandstone (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily SiO2)

Fancy Jasper (Chalcedony (cryptocrystalline quartz) with inclusions) — Mineral

Fancy Jasper

Chalcedony (cryptocrystalline quartz) with inclusions

Rhyolite (Rhyolite (Extrusive Igneous Rock)) — igneous

Rhyolite

Rhyolite (Extrusive Igneous Rock)

Chert (Jasper/Ironstone variety) (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Chert (Jasper/Ironstone variety)

Silicon Dioxide (SiO2) with iron oxide inclusions

Vesicular Basalt with Quartz/Chalcedony (Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)) — igneous

Vesicular Basalt with Quartz/Chalcedony

Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)

Sandstone (likely Ferruginous) (Arenite (primarily SiO2 with Fe2O3 staining)) — sedimentary

Sandstone (likely Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Quartzite (River-worn pebble) (Quartzite (Mainly SiO2)) — metamorphic

Quartzite (River-worn pebble)

Quartzite (Mainly SiO2)

Banded Gneiss (Gneiss (variable mineral composition)) — metamorphic

Banded Gneiss

Gneiss (variable mineral composition)

Travertine (Calcareous Tufa (CaCO3)) — sedimentary

Travertine

Calcareous Tufa (CaCO3)

Sandstone (likely Arkose or Quartz Sandstone) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (likely Arkose or Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Ferruginous Conglomerate (Ferruginous Conglomerate (Clastic Sedimentary Rock)) — sedimentary

Ferruginous Conglomerate

Ferruginous Conglomerate (Clastic Sedimentary Rock)

Fluorite with Quartz coating (Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)) — mineral

Fluorite with Quartz coating

Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Greenstone / Glauconitic Siltstone (Metabasalt or Glauconite-rich Sedimentary Rock) — metamorphic or sedimentary

Greenstone / Glauconitic Siltstone

Metabasalt or Glauconite-rich Sedimentary Rock

metamorphic or sedimentary

Basalt (Basalt (Aphanitic-to-porphyritic mafic volcanic rock)) — igneous

Basalt

Basalt (Aphanitic-to-porphyritic mafic volcanic rock)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Conglomerate (Conglomerate (SiO2, Al2O3, Fe2O3, CaCo3)) — sedimentary

Conglomerate

Conglomerate (SiO2, Al2O3, Fe2O3, CaCo3)

Graywacke (Graywacke (immature sandstone)) — sedimentary

Graywacke

Graywacke (immature sandstone)

Citrine (Silicon Dioxide (SiO2)) — mineral

Citrine

Silicon Dioxide (SiO2)

Quartz (pebble) (Quartz (SiO₂)) — Mineral

Quartz (pebble)

Quartz (SiO₂)

Quartz (Milky/Granular) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Granular)

Silicon Dioxide (SiO2)

Quartzite Pebble (Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebble

Quartzite (primarily SiO2)

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Sandstone-based Concrete Fragment (Cementitious Composite with Sedimentary Aggregate) — sedimentary (man-made/anthropogenic)

Sandstone-based Concrete Fragment

Cementitious Composite with Sedimentary Aggregate

sedimentary (man-made/anthropogenic)

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Basalt (Vesicular) (Basalt (mostly plagioclase, pyroxene, and olivine)) — igneous

Basalt (Vesicular)

Basalt (mostly plagioclase, pyroxene, and olivine)

Basalt River Pebble (Basalt (Aphanitic Mafic Volcanic Rock)) — igneous

Basalt River Pebble

Basalt (Aphanitic Mafic Volcanic Rock)

Red Jasper (Jasper (Silicon Dioxide with Iron Oxide impurities, SiO2)) — sedimentary

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide impurities, SiO2)

Basalt with Quartz/Plagioclase Inclusions (Mafic volcanic rock (Basaltic)) — igneous

Basalt with Quartz/Plagioclase Inclusions

Mafic volcanic rock (Basaltic)

Basalt (Greenstone/Trap Rock) (Basalt (dominated by plagioclase feldspar and pyroxene)) — igneous

Basalt (Greenstone/Trap Rock)

Basalt (dominated by plagioclase feldspar and pyroxene)

Basalt (River Pebble) (Basalt (dominated by Plagioclase Feldspar and Pyroxene)) — igneous

Basalt (River Pebble)

Basalt (dominated by Plagioclase Feldspar and Pyroxene)

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

Scoria (Lava Rock)

Vesicular Basalt / Scoria

Chert (Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Flint)

Silicon Dioxide (SiO2)

Yellow Jasper (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Granite (Granite (Phaneritic Quartz-Feldspar Plutonic Rock)) — igneous

Granite

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Fossiliferous Limestone (Calcareous biomicrite / Bioclastic limestone) — sedimentary

Fossiliferous Limestone

Calcareous biomicrite / Bioclastic limestone

Basalt (Basalt) — igneous

Basalt

Basalt

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Pumice (Vesicular volcanic glass) — igneous

Pumice

Vesicular volcanic glass

Amygdaloidal Basalt with Secondary Minerals (Basalt containing secondary mineralization (likely Chlorite, Celadonite, or Zeolites)) — igneous

Amygdaloidal Basalt with Secondary Minerals

Basalt containing secondary mineralization (likely Chlorite, Celadonite, or Zeolites)

Fossiliferous Limestone (Crinoidal) (Crinoid Limestone (CaCO3 with fossil biological remains)) — sedimentary

Fossiliferous Limestone (Crinoidal)

Crinoid Limestone (CaCO3 with fossil biological remains)

Jasper-Agate Conglomerate (Potentially Puddingstone) (Jasper-cemented Silicate Aggregate (SiO2)) — sedimentary

Jasper-Agate Conglomerate (Potentially Puddingstone)

Jasper-cemented Silicate Aggregate (SiO2)