Rock Identifier

Category

Organic Structure (Not A Rock)

Browse organic structure (not a rock) specimens identified by the Rock Identifier community.

Amethyst (Tumbled Stone) (Amethyst (Silicon Dioxide with Iron impurities, SiO2)) — mineral

Amethyst (Tumbled Stone)

Amethyst (Silicon Dioxide with Iron impurities, SiO2)

Amethyst (Amethyst (Silicon Dioxide, SiO2)) — mineral

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Amphibolite (specifically Hornblende Schist/Gneiss) (Amphibole-rich Metamorphic Rock) — metamorphic

Amphibolite (specifically Hornblende Schist/Gneiss)

Amphibole-rich Metamorphic Rock

Rhyolitic Tuff (Rhyolitic Tuff / Pyroclastic rock) — igneous

Rhyolitic Tuff

Rhyolitic Tuff / Pyroclastic rock

Scoria (Vesicular Basalt) (Scoria (Extrusive Igneous Rock)) — igneous

Scoria (Vesicular Basalt)

Scoria (Extrusive Igneous Rock)

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

Basalt Pebble

Basalt (Mafic volcanic rock)

Scoria (Vesicular Basalt) (Scoria (Extrusive Igneous Rock)) — igneous

Scoria (Vesicular Basalt)

Scoria (Extrusive Igneous Rock)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Quartz (Milky Quartz/Citrine Type) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky Quartz/Citrine Type)

Silicon Dioxide (SiO2)

Aventurine (Quartzite with inclusions (SiO2 containing Fuchsite chrome mica)) — metamorphic

Aventurine

Quartzite with inclusions (SiO2 containing Fuchsite chrome mica)

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

Amethyst

Amethyst (SiO2 with iron impurities)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

River Pebble (Quartz-rich) (Silicon Dioxide (SiO2) with various inclusions) — sedimentary

River Pebble (Quartz-rich)

Silicon Dioxide (SiO2) with various inclusions

Green Chalcedony (likely Green Agate or Chrysoprase) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — Mineral

Green Chalcedony (likely Green Agate or Chrysoprase)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Rose Quartz (Silicon dioxide with traces of titanium, iron, or manganese (SiO2)) — mineral

Rose Quartz

Silicon dioxide with traces of titanium, iron, or manganese (SiO2)

Clear Quartz Cluster (Silicon Dioxide (SiO2)) — mineral

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)) — metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2)) — mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Carnelian Agate (Silicon Dioxide (SiO2)) — mineral

Carnelian Agate

Silicon Dioxide (SiO2)

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

Sandstone

Clastic sedimentary rock (primarily SiO2)

Carnelian (Carnelian (SiO2 - Chalcedony colored by Iron Oxide)) — mineral

Carnelian

Carnelian (SiO2 - Chalcedony colored by Iron Oxide)

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

Granite

Granite (composed of Quartz, Feldspar, and Mica/Amphibole)

Clear Quartz (Crystalline Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Crystalline Silicon Dioxide (SiO2)

Granite / Quartz Vein Rock (Granitoid with Quartz (SiO2)) — igneous

Granite / Quartz Vein Rock

Granitoid with Quartz (SiO2)

Basalt (Basalt (composition predominately plagioclase feldspar and pyroxene)) — igneous

Basalt

Basalt (composition predominately plagioclase feldspar and pyroxene)

Sandstone (Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)) — Sedimentary Rock

Sandstone

Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)

Sedimentary Rock

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

Sedimentary Breccia (Breccia (Clastic Sedimentary Rock)) — sedimentary

Sedimentary Breccia

Breccia (Clastic Sedimentary Rock)

Diorite (with Iron Staining) (Phaneritic Intermediate Igneous Rock) — igneous

Diorite (with Iron Staining)

Phaneritic Intermediate Igneous Rock

Banded Agate (Cryptocrystalline variety of Quartz (SiO2)) — mineral

Banded Agate

Cryptocrystalline variety of Quartz (SiO2)

Slag (Metallurgical by-product) — Anthropogenic (Man-made material)

Slag

Metallurgical by-product

Anthropogenic (Man-made material)

Orca Agate (Chalcedony) (Silicon Dioxide (SiO2) with inclusions) — mineral

Orca Agate (Chalcedony)

Silicon Dioxide (SiO2) with inclusions

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Red Jasper (Silicon Dioxide (SiO2) with Hematite inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Rose Quartz (Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese) — mineral

Rose Quartz

Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese

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

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Quartzite Pebble) (Arenite (SiO2)) — sedimentary

Sandstone (Quartzite Pebble)

Arenite (SiO2)

Sandstone (Red) (Arenite (Fe2O3 heavy)) — sedimentary

Sandstone (Red)

Arenite (Fe2O3 heavy)

Sandstone (likely Arkosic or Quartzose) (Sandstone (SiO2 dominated)) — sedimentary

Sandstone (likely Arkosic or Quartzose)

Sandstone (SiO2 dominated)

Basalt (Basalt (composition of Plagioclase feldspar and Pyroxene)) — igneous

Basalt

Basalt (composition of Plagioclase feldspar and Pyroxene)

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

Amethyst

SiO2 (Silicon Dioxide with iron impurities)

Sandstone (Quartzose Sandstone) (Clastic Sedimentary Rock (primarily SiO2)) — sedimentary

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)