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.

Silicon (Silicon (Si)) — mineral

Silicon

Silicon (Si)

Basalt (River Stone) (Basalt) — igneous

Basalt (River Stone)

Basalt

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Ferruginous Sandstone (Sandstone, Iron-rich) — sedimentary

Ferruginous Sandstone

Sandstone, Iron-rich

Chert (Field Stone) (Microcrystalline / Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Field Stone)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Yellow Jasper (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Ironstone with Pyrite (Ferruginous Sandstone (Fe2O3) with minor Sulfide minerals (FeS2)) — sedimentary

Ironstone with Pyrite

Ferruginous Sandstone (Fe2O3) with minor Sulfide minerals (FeS2)

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

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Yellow Jasper (Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

Conglomerate (Conglomerate (Rock composed predominantly of rounded clasts > 2mm)) — sedimentary

Conglomerate

Conglomerate (Rock composed predominantly of rounded clasts > 2mm)

Banded Gneiss (Gneiss (Metamorphic high-grade rock)) — metamorphic

Banded Gneiss

Gneiss (Metamorphic high-grade rock)

Quartz Vein in Host Rock (Silicon Dioxide (SiO2) within metamorphic/igneous matrix) — igneous/metamorphic

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within metamorphic/igneous matrix

igneous/metamorphic

Grey River Stone (Gneiss/Schist mix) (Foliated Metamorphic Rock (variable mineral formula)) — metamorphic

Grey River Stone (Gneiss/Schist mix)

Foliated Metamorphic Rock (variable mineral formula)

Basalt (Vesicular Basalt) — igneous

Basalt

Vesicular Basalt

Basalt (Water-worn Pebble) (Basalt (Mafic Extrusive Igneous Rock)) — igneous

Basalt (Water-worn Pebble)

Basalt (Mafic Extrusive Igneous Rock)

Limestone (specifically Grainstone or Micrite) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (specifically Grainstone or Micrite)

Calcium Carbonate (CaCO3)

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

Gneiss

Gneiss (High-grade regional metamorphic rock)

Granite (Granite (Phaneritic intrusive igneous rock)) — igneous

Granite

Granite (Phaneritic intrusive igneous rock)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Chert (often called Flint in various colors) (Silicon Dioxide (SiO2)) — sedimentary

Chert (often called Flint in various colors)

Silicon Dioxide (SiO2)

Fossiliferous Limestone (Shell Fragment) (Biogenic Limestone (Calcium Carbonate / CaCO3)) — sedimentary

Fossiliferous Limestone (Shell Fragment)

Biogenic Limestone (Calcium Carbonate / CaCO3)

Porphyritic Basalt (Amygdaloidal Porphyritic Basalt) — igneous

Porphyritic Basalt

Amygdaloidal Porphyritic Basalt

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

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

Vesicular Basalt

Vesicular Basalt (Aphanitic Mafic Rock)

Chert (and Limestone) River Cobble (Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)) — sedimentary

Chert (and Limestone) River Cobble

Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

Ferruginous Chert (Microcrystalline Quartz (SiO2) with Iron Oxides) — sedimentary

Ferruginous Chert

Microcrystalline Quartz (SiO2) with Iron Oxides

Agate (Agate (a variety of Chalcedony, SiO2)) — Mineral

Agate

Agate (a variety of Chalcedony, SiO2)

Milky Quartz (Quartz (Silicon Dioxide - SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Quartzite Pebble (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Blue Quartz (Dumortierite Quartz) (Quartz (SiO2) with inclusions of Dumortierite (Al7(BO3)(SiO4)3O3)) — mineral

Blue Quartz (Dumortierite Quartz)

Quartz (SiO2) with inclusions of Dumortierite (Al7(BO3)(SiO4)3O3)

Conglomerate (Conglomerate (Clastic Sedimentary Rock)) — Sedimentary

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

Banded Siltstone or Argillite (Siltstone (primarily SiO2 with Al and Fe oxides)) — sedimentary

Banded Siltstone or Argillite

Siltstone (primarily SiO2 with Al and Fe oxides)

Quartz (Quartz (SiO₂)) — Mineral

Quartz

Quartz (SiO₂)

Basalt (Basalt (composition of plagioclase feldspar, pyroxene, and olivine)) — igneous

Basalt

Basalt (composition of plagioclase feldspar, pyroxene, and olivine)

Basalt River Stone (Basaltic Igneous Rock) — igneous

Basalt River Stone

Basaltic Igneous Rock

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

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Yellow Quartzite (River Pebble) (Metamorphic Quartzite (SiO2)) — metamorphic

Yellow Quartzite (River Pebble)

Metamorphic Quartzite (SiO2)

Granite (Granite (Phaneritic intrusive igneous rock) - Composition: SiO2, Al2O3, K2O, Na2O) — igneous

Granite

Granite (Phaneritic intrusive igneous rock) - Composition: SiO2, Al2O3, K2O, Na2O

Yellow Chalcedony (Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)) — Mineral

Yellow Chalcedony

Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)