Rock Identifier

Category

Igneous Rock

Browse igneous rock specimens identified by the Rock Identifier community.

Serpentine (Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4) — metamorphic

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4

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

Basalt

Basalt (composition predominately Plagioclase feldspar and Pyroxene)

Basalt (Basalt (Mafic Extrusive)) — igneous

Basalt

Basalt (Mafic Extrusive)

Granite (Plutonic felsic rock (Quartz, Feldspar, Mica)) — igneous

Granite

Plutonic felsic rock (Quartz, Feldspar, Mica)

Vesicular Basalt with Quartz/Chalcedony (Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)) — igneous

Vesicular Basalt with Quartz/Chalcedony

Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)

Basalt (Vesicular Basalt) — igneous

Basalt

Vesicular Basalt

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hypersthene (Hypersthene ((Mg,Fe)SiO₃)) — Mineral

Hypersthene

Hypersthene ((Mg,Fe)SiO₃)

Basalt with Vesicles (Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)) — igneous

Basalt with Vesicles

Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)

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

Quartz (Milky Quartz/Citrine Type)

Silicon Dioxide (SiO2)

Quartz Vein Rock (Quartz (Silicon Dioxide, SiO2)) — igneous

Quartz Vein Rock

Quartz (Silicon Dioxide, SiO2)

Vesicular Basalt with Epidote (Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))) — igneous

Vesicular Basalt with Epidote

Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Quartz Veined Basalt (Mafic Volcanic Rock with Microcrystalline Quartz (SiO2)) — igneous

Quartz Veined Basalt

Mafic Volcanic Rock with Microcrystalline Quartz (SiO2)

Unknown Rock Specimen — igneous

Unknown Rock Specimen

Quartz Vein in Host Rock (Quartz (SiO2) in Mafic or Sedimentary Matrix) — igneous

Quartz Vein in Host Rock

Quartz (SiO2) in Mafic or Sedimentary Matrix

Granodiorite or Diorite (Granodiorite / Diorite) — igneous

Granodiorite or Diorite

Granodiorite / Diorite

Basalt with Quartz/Quartzite Veins (Aphanitic Mafic Volcanic Rock with Siliceous Infillings) — igneous

Basalt with Quartz/Quartzite Veins

Aphanitic Mafic Volcanic Rock with Siliceous Infillings

Basalt (Basalt) — igneous

Basalt

Basalt

Granodiorite (Phaneritic-textured Intrusive Granodiorite) — igneous

Granodiorite

Phaneritic-textured Intrusive Granodiorite

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Porphyritic Basalt (River Rock) (Porphyritic Basalt) — igneous

Porphyritic Basalt (River Rock)

Porphyritic Basalt

Biotite (Black Mica) (Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2) — mineral

Biotite (Black Mica)

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

Unidentifiable Rock Fragment — Uncertain

Unidentifiable Rock Fragment

Conglomerate with Quartz Inclusions (Conglomerate (clastic sedimentary rock) with internal Quartz (SiO2)) — sedimentary

Conglomerate with Quartz Inclusions

Conglomerate (clastic sedimentary rock) with internal Quartz (SiO2)

Sodalite (Sodalite, Na8(Al6Si6O24)Cl2) — mineral

Sodalite

Sodalite, Na8(Al6Si6O24)Cl2

André Landed Here Rock (Glacial Erratic) (Granodiorite / Diorite (compositional estimate)) — igneous

André Landed Here Rock (Glacial Erratic)

Granodiorite / Diorite (compositional estimate)

Unidentified Rock Fragment (Unknown) — Rock

Unidentified Rock Fragment

Unknown

Basalt (Afanitic Mafic Basalt) — igneous

Basalt

Afanitic Mafic Basalt

Basalt (Mafic volcanic rock (primarily plagioclase, pyroxene, and olivine)) — Igneous

Basalt

Mafic volcanic rock (primarily plagioclase, pyroxene, and olivine)

Porphyritic Basalt (Porphyritic Basalt (with Plagioclase phenocrysts)) — igneous

Porphyritic Basalt

Porphyritic Basalt (with Plagioclase phenocrysts)

Porphyritic Basalt (with Pyrolusite or Iron-oxide staining) (Porphyritic Basalt (Mafic Extrusive)) — igneous

Porphyritic Basalt (with Pyrolusite or Iron-oxide staining)

Porphyritic Basalt (Mafic Extrusive)

Basalt with Iron Oxidation (Lattice/Veined) (Mafic Volcanic Rock (principally Plagioclase and Pyroxene)) — igneous

Basalt with Iron Oxidation (Lattice/Veined)

Mafic Volcanic Rock (principally Plagioclase and Pyroxene)

Basalt with Plagioclase Phenocrysts (Porphyritic Basalt) — igneous

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt

Vesicular Basalt (Scoria) (Vesicular Basalt) — igneous

Vesicular Basalt (Scoria)

Vesicular Basalt

Gneiss (Pebble) (Gneiss) — metamorphic

Gneiss (Pebble)

Gneiss

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

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Basalt with Calcite Veins (Basalt (containing CaCO3 inclusions)) — igneous

Basalt with Calcite Veins

Basalt (containing CaCO3 inclusions)

Pumice (Pumice (Vesicular Rhyolite/Andesite)) — igneous

Pumice

Pumice (Vesicular Rhyolite/Andesite)

Druzy Quartz (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz

Silicon Dioxide (SiO2)

Vesicular Basalt (or Scoria) (Vesicular Basalt (Aphanitic-vesicular volcanic rock)) — igneous

Vesicular Basalt (or Scoria)

Vesicular Basalt (Aphanitic-vesicular volcanic rock)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Basalt with Quartz/Calcite Veins (Amygdaloidal Basalt (SiO2 or CaCO3 inclusions)) — igneous

Basalt with Quartz/Calcite Veins

Amygdaloidal Basalt (SiO2 or CaCO3 inclusions)