Rock Identifier

Category

Not A Rock (Man Made Origin)

Browse not a rock (man made origin) specimens identified by the Rock Identifier community.

Banded Agate (Polished Slice) (Chalcedony (cryptocrystalline Quartz), SiO2) — mineral

Banded Agate (Polished Slice)

Chalcedony (cryptocrystalline Quartz), SiO2

Quartzite with Chlorite/Epidote (Metamorphosed Quartzite (SiO2)) — metamorphic

Quartzite with Chlorite/Epidote

Metamorphosed Quartzite (SiO2)

Agate (Silicon Dioxide (SiO2)) — mineral

Agate

Silicon Dioxide (SiO2)

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

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Sandstone with Quartz Vein (Arenite with SiO2 intrusion) — sedimentary

Sandstone with Quartz Vein

Arenite with SiO2 intrusion

Gneiss (High-Grade Metamorphic Rock) (Gneiss (primarily composed of Quartz, Feldspar, and Mica/Amphiboles)) — metamorphic

Gneiss (High-Grade Metamorphic Rock)

Gneiss (primarily composed of Quartz, Feldspar, and Mica/Amphiboles)

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

Hematite

Iron(III) oxide (Fe2O3)

Quartz Druzy on Basalt (Silicon Dioxide (SiO2) on Mafic Volcanic Rock) — Mineral on Igneous Rock

Quartz Druzy on Basalt

Silicon Dioxide (SiO2) on Mafic Volcanic Rock

Mineral on Igneous Rock

Granite (Felsic Plutonic Rock (primarily SiO2)) — igneous

Granite

Felsic Plutonic Rock (primarily SiO2)

Granite (Phaneritic plutonic rock (Quartz + Feldspar + Mica)) — igneous

Granite

Phaneritic plutonic rock (Quartz + Feldspar + Mica)

Basalt River Stone (Basaltic Igneous Rock) — igneous

Basalt River Stone

Basaltic Igneous Rock

Limestone (with potential fossil inclusions) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (with potential fossil inclusions)

Calcium Carbonate (CaCO3)

Limestone (Grey and White specimens) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (Grey and White specimens)

Calcium Carbonate (CaCO3)

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

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Boxwork Quartz / Septarian Jasper (Boxwork (SiO2 with iron oxide inclusions)) — metamorphic

Boxwork Quartz / Septarian Jasper

Boxwork (SiO2 with iron oxide inclusions)

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Granite (Plutonic felsic igneous rock) — igneous

Granite

Plutonic felsic igneous rock

Granite (Granite) — Igneous

Granite

Granite

Sandstone (lithic/greywacke variant) (Clastic sedimentary rock (primarily SiO2 with rock fragments)) — sedimentary

Sandstone (lithic/greywacke variant)

Clastic sedimentary rock (primarily SiO2 with rock fragments)

Gneiss (Gneiss (a metamorphic rock)) — Metamorphic

Gneiss

Gneiss (a metamorphic rock)

Chert (Nodule) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Serpentinite (Serpentinite (composed primarily of minerals in the Serpentine group)) — metamorphic

Serpentinite

Serpentinite (composed primarily of minerals in the Serpentine group)

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

Banded Gneiss

Gneiss (High-grade metamorphic rock)

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

Basalt with Quartz Vein (Mafic Igneous Rock (SiO2 filling)) — igneous

Basalt with Quartz Vein

Mafic Igneous Rock (SiO2 filling)

Basalt (Mafic volcanic rock (Primarily Plagioclase Feldspar and Pyroxene)) — Igneous

Basalt

Mafic volcanic rock (Primarily Plagioclase Feldspar and Pyroxene)

Basalt (Basalt) — igneous

Basalt

Basalt

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Granular Sandstone (Arenite (variable composition, primarily SiO2)) — sedimentary

Granular Sandstone

Arenite (variable composition, primarily SiO2)

Granite (Granite (composed mainly of Quartz, Feldspar, and Mica)) — igneous

Granite

Granite (composed mainly of Quartz, Feldspar, and Mica)

Agate Geode Slice (with Druzy Quartz) (Silicon Dioxide (SiO2)) — mineral

Agate Geode Slice (with Druzy Quartz)

Silicon Dioxide (SiO2)

Granodiorite (Granodiorite (Intermediate intrusive igneous rock)) — igneous

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Crinoid Fossil in Limestone (Crinoid (Class Crinoidea) in Fossiliferous Limestone (CaCO3)) — sedimentary

Crinoid Fossil in Limestone

Crinoid (Class Crinoidea) in Fossiliferous Limestone (CaCO3)

Basalt River Cobble (Basalt (Composition primarily Plagioclase Feldspar and Pyroxene)) — igneous

Basalt River Cobble

Basalt (Composition primarily Plagioclase Feldspar and Pyroxene)

Basalt (Extrusive Mafic Igneous Rock) — igneous

Basalt

Extrusive Mafic Igneous Rock

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

Basalt (River Cobble)

Basalt (Mafic Extrusive Igneous Rock)

Granodiorite (Granodiorite (Intermediate intrusive igneous rock)) — igneous

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Sandstone (Arenite (SiO2 predominantly)) — sedimentary

Sandstone

Arenite (SiO2 predominantly)

Quartz Crystal (specifically a Double-Terminated variety) (Silicon Dioxide (SiO2) - Low Quartz) — mineral

Quartz Crystal (specifically a Double-Terminated variety)

Silicon Dioxide (SiO2) - Low Quartz

Quartz in Host Rock (Silicon Dioxide (SiO2) in Rhyolite or Granite matrix) — igneous

Quartz in Host Rock

Silicon Dioxide (SiO2) in Rhyolite or Granite matrix