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.

Chert (containing Flint nodules) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (containing Flint nodules)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Basalt (Basalt (Mafic Extrusive Igneous Rock)) — igneous

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Druzy Quartz (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz

Silicon Dioxide (SiO2)

Carnelian (a variety of Chalcedony) (Silicon Dioxide (SiO2) with iron oxide impurities) — mineral

Carnelian (a variety of Chalcedony)

Silicon Dioxide (SiO2) with iron oxide impurities

Porphyritic Basalt (with Pyrolusite or Iron-oxide staining) (Porphyritic Basalt (Mafic Extrusive)) — igneous

Porphyritic Basalt (with Pyrolusite or Iron-oxide staining)

Porphyritic Basalt (Mafic Extrusive)

Banded Gneiss (Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Biotite/Amphiboles)) — metamorphic

Banded Gneiss

Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Biotite/Amphiboles)

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

Dyed Chalcedony (Agate)

Silicon Dioxide (SiO2) with artificial pigment

Moqui Marble (Shaman Stone) (Iron Oxide Concretion (composed primarily of Quartz sand with Hematite/Goethite shell)) — sedimentary

Moqui Marble (Shaman Stone)

Iron Oxide Concretion (composed primarily of Quartz sand with Hematite/Goethite shell)

Basalt (Basalt) — igneous

Basalt

Basalt

Jasper (Iron-stained Quartzite/Chert) (Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) impurities) — sedimentary

Jasper (Iron-stained Quartzite/Chert)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) impurities

Chert (Flint) (Chert (Cryptocrystalline Quartz, SiO2)) — sedimentary

Chert (Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Red Jasper (Silicon Dioxide (SiO₂)) — sedimentary

Red Jasper

Silicon Dioxide (SiO₂)

Chert (specifically Flint) (Chert (SiO2)) — sedimentary

Chert (specifically Flint)

Chert (SiO2)

Shale (sub-type: Carbonaceous Shale) (Lutaceous Sedimentary Rock) — sedimentary

Shale (sub-type: Carbonaceous Shale)

Lutaceous Sedimentary Rock

Basalt (Mafic extrusive igneous rock) — igneous

Basalt

Mafic extrusive igneous rock

Carnelian (Chalcedony (cryptocrystalline quartz), SiO2) — Mineral

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Silicon dioxide (SiO₂)) — Mineral

Quartz

Silicon dioxide (SiO₂)

Hematite (Iron(III) oxide (Fe2O3)) — Mineral

Hematite

Iron(III) oxide (Fe2O3)

Basalt (Fieldstone) (Basalt) — igneous

Basalt (Fieldstone)

Basalt

Belemnite Fossil (Guard) (Belemnoidea (Carbonate/Calcite replacement)) — sedimentary

Belemnite Fossil (Guard)

Belemnoidea (Carbonate/Calcite replacement)

Septarian Nodule (Yellow Jasper variety) (Septarian Nodule (comprising Calcite, Aragonite, and Limestone/Bentonite)) — sedimentary

Septarian Nodule (Yellow Jasper variety)

Septarian Nodule (comprising Calcite, Aragonite, and Limestone/Bentonite)

Fossiliferous Limestone (Limestone (composed primarily of calcite with included fossils CaCO3)) — Sedimentary

Fossiliferous Limestone

Limestone (composed primarily of calcite with included fossils CaCO3)

Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment) (Quartz (SiO₂)) — Mineral

Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)

Quartz (SiO₂)

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

Quartz Pebble (Iron-stained)

Silicon Dioxide (SiO2)

Scoria (Extrusive Igneous Rock (Basaltic/Andesitic Composition)) — igneous

Scoria

Extrusive Igneous Rock (Basaltic/Andesitic Composition)

Mookaite (Mookaite Jasper) (Silicified Radiolarite (SiO2 with iron oxides)) — sedimentary

Mookaite (Mookaite Jasper)

Silicified Radiolarite (SiO2 with iron oxides)

Specular Hematite (Specularite) (Iron Oxide (Fe2O3)) — mineral

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

Basalt (Basalt (composition mainly of Plagioclase feldspar, Pyroxene, and Olivine)) — igneous

Basalt

Basalt (composition mainly of Plagioclase feldspar, Pyroxene, and Olivine)

Basalt River Stone (Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)) — igneous

Basalt River Stone

Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Basalt (Stream-worn Cobble) (Mafic Igneous Rock (primarily Plagioclase and Pyroxene)) — igneous

Basalt (Stream-worn Cobble)

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Vesicular Basalt (Scoria) (Aphanitic Mafic Igneous Rock (Vesicular Basalt)) — igneous

Vesicular Basalt (Scoria)

Aphanitic Mafic Igneous Rock (Vesicular Basalt)

Quartz (likely a form of massive or vein quartz) (Quartz (SiO₂)) — Mineral

Quartz (likely a form of massive or vein quartz)

Quartz (SiO₂)

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

Scoria (Lava Rock)

Vesicular Basalt / Scoria

Jasper (Green Jasper/Chert) (Silicon Dioxide (SiO2)) — sedimentary

Jasper (Green Jasper/Chert)

Silicon Dioxide (SiO2)

Basalt (Basalt (Mafic Extrusive)) — igneous

Basalt

Basalt (Mafic Extrusive)

Basalt (Basalt (Mafic Extrusive Rock)) — igneous

Basalt

Basalt (Mafic Extrusive Rock)

Banded Agate (specifically Sardonyx Agate) (Silicon Dioxide (SiO2) - Chalcedony variety) — mineral

Banded Agate (specifically Sardonyx Agate)

Silicon Dioxide (SiO2) - Chalcedony variety

Scoria (Lava Rock) (Scoria (Mafic Volcanic Rock)) — igneous

Scoria (Lava Rock)

Scoria (Mafic Volcanic Rock)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)