Rock Identifier

Category

Igneous

Browse igneous specimens identified by the Rock Identifier community.

Learn about Igneous in the encyclopedia

Albitite

Alnöite

Andesite

Anorthosite

Apache Tears

Banded Obsidian

Banded Obsidian

Basalt

Black Obsidian

Blue Pearl Granite

Blue Pearl Granite

Boninite

Bostonite

Brown Obsidian

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Granite (Granite (Phaneritic Igneous Rock)) — igneous

Granite

Granite (Phaneritic Igneous Rock)

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

Sodalite (Na8(Al6Si6O24)Cl2) — mineral

Sodalite

Na8(Al6Si6O24)Cl2

Tumbled banded stone, likely labradorite or larvikite (Plagioclase feldspar aggregate; commonly labradorite (labradorescence) or larvikite) — mineral

Tumbled banded stone, likely labradorite or larvikite

Plagioclase feldspar aggregate; commonly labradorite (labradorescence) or larvikite

Tumbled quartz-rich pebble (Microcrystalline quartz (SiO₂), possibly milky quartz or chalcedony) — mineral

Tumbled quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly milky quartz or chalcedony

Milky quartz (iron-stained quartz) (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz (iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Granite (Felsic intrusive igneous rock) — igneous

Granite

Felsic intrusive igneous rock

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

Granite (Granite (Phaneritic Igneous Rock)) — igneous

Granite

Granite (Phaneritic Igneous Rock)

Basalt (Extrusive Igneous Rock (Mafic)) — igneous

Basalt

Extrusive Igneous Rock (Mafic)

Granite (Felsic intrusive igneous rock) — igneous

Granite

Felsic intrusive igneous rock

Magnetite (Iron Ore) (Magnetite (Fe3O4)) — mineral

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Quartz (Pegmatitic Quartz with Feldspar) (SiO2 (Silicon Dioxide)) — mineral

Quartz (Pegmatitic Quartz with Feldspar)

SiO2 (Silicon Dioxide)

Granite (Granite (Phaneritic igneous rock)) — igneous

Granite

Granite (Phaneritic igneous rock)

Granite Pebble (Phaneritic Felsic Igneous Rock) — igneous

Granite Pebble

Phaneritic Felsic Igneous Rock

Coarse-grained gray igneous rock, likely granite or granodiorite (Granite–granodiorite; mainly quartz, feldspar, and mica (exact identification requires testing)) — igneous

Coarse-grained gray igneous rock, likely granite or granodiorite

Granite–granodiorite; mainly quartz, feldspar, and mica (exact identification requires testing)

Dark coarse-grained igneous rock, likely gabbro or diabase (Gabbro–diabase; chiefly plagioclase feldspar and pyroxene, with possible olivine and opaque iron-titanium oxides) — igneous

Dark coarse-grained igneous rock, likely gabbro or diabase

Gabbro–diabase; chiefly plagioclase feldspar and pyroxene, with possible olivine and opaque iron-titanium oxides

Dark gray igneous rock, likely basalt (Basalt; fine-grained plagioclase–pyroxene rock, commonly with minor olivine and magnetite) — igneous

Dark gray igneous rock, likely basalt

Basalt; fine-grained plagioclase–pyroxene rock, commonly with minor olivine and magnetite

Tumbled dark igneous rock, likely basalt (Basalt; commonly composed of plagioclase feldspar, pyroxene, and olivine) — igneous

Tumbled dark igneous rock, likely basalt

Basalt; commonly composed of plagioclase feldspar, pyroxene, and olivine

Coarse-grained gray igneous rock, likely granite or granodiorite (Granite–granodiorite; chiefly quartz, feldspar, and dark mica/amphibole) — igneous

Coarse-grained gray igneous rock, likely granite or granodiorite

Granite–granodiorite; chiefly quartz, feldspar, and dark mica/amphibole

Fine-grained gray igneous rock, likely basalt (Basalt; primarily plagioclase feldspar and pyroxene, commonly with olivine and iron-titanium oxides) — igneous

Fine-grained gray igneous rock, likely basalt

Basalt; primarily plagioclase feldspar and pyroxene, commonly with olivine and iron-titanium oxides

Dark mafic igneous rock, likely basalt or gabbro (Basaltic rock composed chiefly of plagioclase feldspar and pyroxene, with possible olivine and iron-oxide minerals) — igneous

Dark mafic igneous rock, likely basalt or gabbro

Basaltic rock composed chiefly of plagioclase feldspar and pyroxene, with possible olivine and iron-oxide minerals

Fine-grained dark igneous rock, likely basalt (Basalt (approximate identification; commonly plagioclase, pyroxene, and minor olivine)) — igneous

Fine-grained dark igneous rock, likely basalt

Basalt (approximate identification; commonly plagioclase, pyroxene, and minor olivine)

Fine-grained dark igneous rock, likely basalt (Basalt; predominantly plagioclase feldspar and pyroxene, commonly with minor olivine and iron-titanium oxides) — igneous

Fine-grained dark igneous rock, likely basalt

Basalt; predominantly plagioclase feldspar and pyroxene, commonly with minor olivine and iron-titanium oxides

Dark mafic igneous rock, likely basalt or gabbro (Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine) — igneous

Dark mafic igneous rock, likely basalt or gabbro

Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine

Likely basalt or other dark igneous rock (Basalt; predominantly plagioclase feldspar and pyroxene, possibly olivine) — igneous

Likely basalt or other dark igneous rock

Basalt; predominantly plagioclase feldspar and pyroxene, possibly olivine

Dark mafic igneous rock, likely basalt or gabbro (Basalt–gabbroic rock; mainly plagioclase feldspar and pyroxene, possibly olivine or magnetite) — igneous

Dark mafic igneous rock, likely basalt or gabbro

Basalt–gabbroic rock; mainly plagioclase feldspar and pyroxene, possibly olivine or magnetite

Dark mafic igneous rock, likely basalt or gabbro (Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine and iron oxides) — igneous

Dark mafic igneous rock, likely basalt or gabbro

Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine and iron oxides

Granite (Plutonic felsic igneous rock) — igneous

Granite

Plutonic felsic igneous rock

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

Quartz fragment (Quartz (silicon dioxide, SiO₂), likely milky or smoky quartz) — mineral

Quartz fragment

Quartz (silicon dioxide, SiO₂), likely milky or smoky quartz

Biotite in Host Matrix (Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)) — mineral

Biotite in Host Matrix

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Hypersthene (or Enstatite/Ferrosilite) (Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)) — Mineral

Hypersthene (or Enstatite/Ferrosilite)

Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)

Peridotite Nodules in Basalt (Xenolith) (Ultramafic Xenolith (Olivine-rich Peridotite in Basalt)) — igneous

Peridotite Nodules in Basalt (Xenolith)

Ultramafic Xenolith (Olivine-rich Peridotite in Basalt)

Uncertain—likely weathered granite or quartz-rich rock (Granite (quartz–feldspar–mica aggregate), tentative) — igneous

Uncertain—likely weathered granite or quartz-rich rock

Granite (quartz–feldspar–mica aggregate), tentative

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Agate (Silicon dioxide (Chalcedony), SiO2) — sedimentary

Agate

Silicon dioxide (Chalcedony), SiO2

Tumbled Agate (Silicon Dioxide (Chalcedony / Quartz)) — gemstone

Tumbled Agate

Silicon Dioxide (Chalcedony / Quartz)

Chalcopyrite (CuFeS2 (Copper Iron Sulfide)) — mineral

Chalcopyrite

CuFeS2 (Copper Iron Sulfide)