Rock Identifier

Category

Mineralogical Specimen

Browse mineralogical specimen specimens identified by the Rock Identifier community.

Learn about Mineralogical Specimen in the encyclopedia

Emerald in Matrix

Emerald in Matrix

Morganite Crystal

Morganite Crystal

Aquamarine Matrix

Aquamarine Matrix

Emerald Crystal

Emerald Crystal

Aquamarine Crystal

Aquamarine Crystal

Mushroom Tourmaline

Mushroom Tourmaline

White Beryl

Smoky Quartz

Clear Obsidian

Goshenite Crystal

Goshenite Crystal

Magnetite

Crocoite

Chert (Pink Jasper) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Pink Jasper)

Microcrystalline Quartz (SiO2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Limonite Ironstone (Goethite-Limonite concretion / Iron oxide) — sedimentary

Limonite Ironstone

Goethite-Limonite concretion / Iron oxide

Pumice (Pumice (Vesicular Felsic Igneous Rock)) — igneous

Pumice

Pumice (Vesicular Felsic Igneous Rock)

Tumbled Agate (Silicon Dioxide (SiO2)) — sedimentary

Tumbled Agate

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Druzy Quartz (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz

Silicon Dioxide (SiO2)

Vesicular Basalt with Feldspar Phenocrysts (Porphyritic Basalt) — igneous

Vesicular Basalt with Feldspar Phenocrysts

Porphyritic Basalt

Gabbro (Phaneritic mafic intrusive igneous rock) — igneous

Gabbro

Phaneritic mafic intrusive igneous rock

Quartz pebble (Silicon dioxide (SiO2)) — mineral

Quartz pebble

Silicon dioxide (SiO2)

Banded Sandstone / Quartzite Pebble (Sedimentary quartz arenite with liesegang banding) — sedimentary

Banded Sandstone / Quartzite Pebble

Sedimentary quartz arenite with liesegang banding

Tumbled Agate (Silicon Dioxide (Chalcedony variety), SiO2) — gemstone

Tumbled Agate

Silicon Dioxide (Chalcedony variety), SiO2

Pink Quartz / Quartzite (Silicon Dioxide (SiO2)) — metamorphic

Pink Quartz / Quartzite

Silicon Dioxide (SiO2)

Scoria (Vesicular Mafic Igneous Rock) — igneous

Scoria

Vesicular Mafic Igneous Rock

Chert / Flint (Silicon dioxide (SiO2)) — sedimentary

Chert / Flint

Silicon dioxide (SiO2)

K-Feldspar (Microcline / Orthoclase) (Potassium Feldspar (KAlSi3O8)) — mineral

K-Feldspar (Microcline / Orthoclase)

Potassium Feldspar (KAlSi3O8)

Pitted Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Pitted Limestone

Calcium Carbonate (CaCO3)

Diorite (or Gabbro / Pegmatitic Intrusive Rock) (Plagioclase-Amphibole Igneous Rock) — igneous

Diorite (or Gabbro / Pegmatitic Intrusive Rock)

Plagioclase-Amphibole Igneous Rock

River Cobble (Quartzite / Sandstone) (Quartzite / Siliciclastic Sedimentary Rock) — sedimentary

River Cobble (Quartzite / Sandstone)

Quartzite / Siliciclastic Sedimentary Rock

Quartz Matrix with Iron Staining / Mica Schist (Silicon Dioxide (SiO2) with Iron Oxide staining) — mineral

Quartz Matrix with Iron Staining / Mica Schist

Silicon Dioxide (SiO2) with Iron Oxide staining

Fossiliferous Sandstone Pebble (with Crinoid / Shell Impression) (Sandstone containing fossiliferous inclusions (SiO2 matrix with calcite/silica cast fossil)) — sedimentary

Fossiliferous Sandstone Pebble (with Crinoid / Shell Impression)

Sandstone containing fossiliferous inclusions (SiO2 matrix with calcite/silica cast fossil)

Schist (Greenschist / Mica Schist) (Schist (variable mineral composition, commonly containing quartz, feldspar, mica, chlorite)) — metamorphic

Schist (Greenschist / Mica Schist)

Schist (variable mineral composition, commonly containing quartz, feldspar, mica, chlorite)

Quartz (Milky/Chalcedony variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Chalcedony variety)

Silicon Dioxide (SiO2)

Polished Red Quartz (or Carnelian / Red Jasper) (Silicon Dioxide (SiO2)) — mineral

Polished Red Quartz (or Carnelian / Red Jasper)

Silicon Dioxide (SiO2)

Pegmatite / Granite with Mica (Pegmatite (Igneous Rock composed of Quartz, Feldspar, and Muscovite Mica)) — igneous

Pegmatite / Granite with Mica

Pegmatite (Igneous Rock composed of Quartz, Feldspar, and Muscovite Mica)

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

Amethyst (Tumbled)

Silicon Dioxide (SiO2) with iron impurities

Banded Agate / Shell Fossil Fragment (Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)) — sedimentary

Banded Agate / Shell Fossil Fragment

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)

Granite Pebble (Granite (plutonic felsic intrusive rock)) — igneous

Granite Pebble

Granite (plutonic felsic intrusive rock)

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Chert (Microcrystalline quartz (SiO2)) — sedimentary

Chert

Microcrystalline quartz (SiO2)

Quartz (Tumbled Peach/Pink Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Tumbled Peach/Pink Quartz)

Silicon Dioxide (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Corundum (Sapphire in Matrix) (Aluminum Oxide (Al2O3)) — mineral

Corundum (Sapphire in Matrix)

Aluminum Oxide (Al2O3)

Quartz-veined Sandstone Pebble (Quartzite-veined Arenite) — sedimentary

Quartz-veined Sandstone Pebble

Quartzite-veined Arenite

Graphite (Graphite (Carbon, C)) — mineral

Graphite

Graphite (Carbon, C)

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

Pink Quartz Pebble

Silicon Dioxide (SiO2)

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

Clear Quartz Crystal

Silicon Dioxide (SiO2), Quartz

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

Tumbled Clear Quartz

Silicon Dioxide (SiO2)

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

Quartz Crystal Cluster

Silicon Dioxide (SiO2)