Rock Identifier

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All rocks & minerals

Every specimen the Rock Identifier community has discovered, from desert agates to deep-sea basalts.

Explore the rock & mineral encyclopedia

Acanthite

Achroite

Adinole

Adirondack Garnet

Adirondack Garnet

Adularia

Agate

Albite

Albitite

Alexandrite

Alkali Feldspar

Alkali Feldspar

Almandine Garnet

Almandine Garnet

Alnöite

Sandstone (Arenite (SiO2 principal composition)) — sedimentary

Sandstone

Arenite (SiO2 principal composition)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Quartz (Milky or Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky or Iron-stained)

Silicon Dioxide (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

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

Potassium Feldspar

K-Feldspar (Orthoclase/Microcline), KAlSi3O8

Jasper with Iron Oxides (Silicon Dioxide (SiO2) with Fe2O3 inclusions) — sedimentary

Jasper with Iron Oxides

Silicon Dioxide (SiO2) with Fe2O3 inclusions

Gossan (Iron Cap) (Limonitic Gossan (FeO(OH)·nH2O)) — sedimentary

Gossan (Iron Cap)

Limonitic Gossan (FeO(OH)·nH2O)

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Sandstone (Ferruginous) (Arenite (with Iron Oxide cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Green Quartzite (Metamorphosed Quartz-Arenite (SiO2)) — metamorphic

Green Quartzite

Metamorphosed Quartz-Arenite (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartzite (Metamorphosed Quartz Sandstone (primarily SiO2)) — metamorphic

Quartzite

Metamorphosed Quartz Sandstone (primarily SiO2)

Basalt (Basalt (Extrusive Igneous Rock)) — igneous

Basalt

Basalt (Extrusive Igneous Rock)

Basalt with Oxidized Inclusions (Extrusive Mafic Igneous Rock (primarily Plagioclase and Pyroxene)) — igneous

Basalt with Oxidized Inclusions

Extrusive Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Granite River Pebble (Granite (Phaneritic Igneous Rock)) — igneous

Granite River Pebble

Granite (Phaneritic Igneous Rock)

Basalt River Stone (Aphanitic Mafic Volcanic Rock) — igneous

Basalt River Stone

Aphanitic Mafic Volcanic Rock

Chert (Flint) (Chert (Silicon Dioxide, SiO2)) — sedimentary

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Favosites Fossil (Honeycomb Coral) (Favosites goldfussi / Order Tabulata) — fossil

Favosites Fossil (Honeycomb Coral)

Favosites goldfussi / Order Tabulata

Quartz-veined Greywacke (Silicon dioxide (SiO2) in Lithic Sandstone) — sedimentary

Quartz-veined Greywacke

Silicon dioxide (SiO2) in Lithic Sandstone

Quartzite (Metamorphosed Sandstone (primarily SiO2)) — metamorphic

Quartzite

Metamorphosed Sandstone (primarily SiO2)

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

Chert / Jasper

Silicon Dioxide (SiO2)

Milky Quartz Pebble (Crystalline Silicon Dioxide (SiO2)) — mineral

Milky Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

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

Granite

Granite (Phaneritic intrusive igneous rock)

Quartzite River Rock (Quartzite ($SiO_2$)) — metamorphic

Quartzite River Rock

Quartzite ($SiO_2$)

Basalt River Stone (Basalt) — igneous

Basalt River Stone

Basalt

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Bivalve Fossil (Internal Mold) (Class Bivalvia (Indeterminate genus)) — fossil

Bivalve Fossil (Internal Mold)

Class Bivalvia (Indeterminate genus)

Quartz Vein in Gneiss or Schist (Metamorphic rock with SiO2 vein) — metamorphic

Quartz Vein in Gneiss or Schist

Metamorphic rock with SiO2 vein

Granite Pebble (Granite) — igneous

Granite Pebble

Granite

Granite Pebble (Phaneritic plutonic rock (Quartz-Alkali Feldspar-Plagioclase)) — igneous

Granite Pebble

Phaneritic plutonic rock (Quartz-Alkali Feldspar-Plagioclase)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Quartzite (Metamorphic Quartz (SiO2)) — metamorphic

Quartzite

Metamorphic Quartz (SiO2)

Vesicular Basalt (Scoria) (Basalt with vesicular texture) — igneous

Vesicular Basalt (Scoria)

Basalt with vesicular texture

Quartzite with Quartz Vein (Metamorphosed Quartz-rich Sandstone (SiO2)) — metamorphic

Quartzite with Quartz Vein

Metamorphosed Quartz-rich Sandstone (SiO2)

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

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Milky Quartz in Siltstone or Feldspar (Silicon Dioxide (SiO2)) — mineral

Milky Quartz in Siltstone or Feldspar

Silicon Dioxide (SiO2)

Green Aventurine (Silicon Dioxide (SiO2) with Fuchsite inclusions) — metamorphic

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Greenschist (Chlorite Schist) (Greenschist (containing Chlorite, Actinolite, and Epidote)) — metamorphic

Greenschist (Chlorite Schist)

Greenschist (containing Chlorite, Actinolite, and Epidote)

Green Aventurine (Quartz with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)) — mineral

Green Aventurine

Quartz with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Ruby (Corundum) (Aluminum oxide (Al2O3) with Chromium traces) — gemstone

Ruby (Corundum)

Aluminum oxide (Al2O3) with Chromium traces

Rose Quartz (SiO2 (Silicon Dioxide)) — gemstone

Rose Quartz

SiO2 (Silicon Dioxide)