Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Category
Basalt
Browse basalt specimens identified by the Rock Identifier community.
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Polished black stone, possibly basalt
Likely fine-grained basalt; exact identification is uncertain from the image alone.
igneous
Dark mafic rock, possibly basalt or scoria
Basaltic rock; likely plagioclase–pyroxene ± olivine, with possible vesicular texture
igneous
Basalt pendant
Basalt; predominantly plagioclase feldspar, pyroxene, and commonly olivine
igneous
Tumbled vesicular basalt (likely weathered basalt pebble)
Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, with possible olivine and secondary zeolite/calcite minerals
igneous
Vesicular basalt (weathered lava rock)
Basalt, predominantly plagioclase, pyroxene, and minor olivine/iron oxides
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Gabbro
Gabbro
igneous
Gabbro
Gabbro (Coarse-grained Mafic Igneous Rock)
igneous
Vesicular Basalt
Basalt (extrusive volcanic rock)
igneous
Basalt with Plagioclase Phenocryst
Porphyritic Basalt
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Vesicular Basalt (Amygdaloidal)
Vesicular Basalt (Fe-Mg rich extrusive volcanic rock)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Basalt
Extrusive igneous rock
igneous
Basalt with Iron Oxidation
Mafic Igneous Rock (Basalt)
igneous
Basalt
Aphanitic Mafic Igneous Rock
igneous
Vesicular basalt with a pale mineral vesicle filling
Basalt, likely amygdaloidal basalt; pale filling may be calcite, zeolite, or quartz
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt
Extrusive igneous rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Dark, iron-stained rock; exact identification uncertain
Possibly a fine-grained mafic igneous rock (basalt or diabase); image alone is insufficient for a reliable species-level identification
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt
Basalt (Volcanic Mafic Rock)
igneous
Vesicular Basalt (Amygdaloidal)
Amygdaloidal Basalt
igneous
Quartz Druzy on Basalt
Silicon Dioxide (SiO2) on Mafic Volcanic Rock
Mineral on Igneous Rock
Native Copper in Basalt
Cu-element in Mafic Volcanic Rock (Basalt)
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt
Mafic extrusive igneous rock
igneous
Basalt
Mafic Volcanic Rock
igneous
Basalt
Extrusive igneous rock
igneous
Basalt
Extrusive mafic igneous rock
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt
Basalt (extrusive volcanic rock)
igneous
Dark volcanic rock, likely basalt
Basalt (fine-grained mafic volcanic rock; exact identification requires testing)
igneous
Basalt
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt
Mafic Extrusive Igneous Rock
igneous
Basalt
Basalt (Extrusive Igneous Rock)
igneous
Basalt
Mafic Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Rounded dark cobble, likely basalt
Probable basalt; exact identification cannot be confirmed from the photograph
igneous