Porphyritic Basalt
Porphyritic Basalt (containing Plagioclase or Alkali Feldspar phenocrysts)
igneous
Category
Basalt
Browse basalt specimens identified by the Rock Identifier community.
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Basalt (Polished)
Extrusive mafic igneous rock
igneous
Basalt (Vesicular)
Basalt (Extrusive Volcanic Rock)
igneous
Basalt (Arrowhead form)
Extrusive mafic igneous rock
igneous
Basalt River Cobble
Basalt (Mafic volcanic rock)
igneous
Amygdaloidal Basalt with Quartz Infill
Basalt (SiO2 for the quartz inclusion)
igneous
Amygdaloidal Basalt with Secondary Minerals
Basalt containing secondary mineralization (likely Chlorite, Celadonite, or Zeolites)
igneous
Olivine (Peridot)
Olivine (Mg, Fe)2SiO4
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Basalt (with possible mineral veining)
Basalt (Aphanitic Mafic Igneous Rock)
Igneous
Basalt (River Stone)
Afanitic Basalt (primarily Plagioclase Feldspar and Pyroxene)
igneous
Basalt (Polished River Stone)
Mafic Volcanic Rock (primarily Plagioclase and Pyroxene)
Igneous
Basalt (Beach Pebble)
Extrusive mafic igneous rock
igneous
Basalt (River Rock Cobble)
Extrusive mafic volcanic rock (Basalt)
igneous
Basalt (River-worn Specimen)
Extrusive Mafic Igneous Rock
igneous
Basalt (Crushed Roadstone)
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Basalt (River Stone)
Extrusive mafic igneous rock
igneous
Basalt (River Pebble)
Extrusive mafic igneous rock
igneous
Basalt (Weathered/River worn)
Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)
igneous
Basalt (Polished pebble)
Basalt (Aphanitic mafic volcanic rock)
igneous
Basalt (Road Gravel)
Aphanitic mafic volcanic rock (various compositions of plagioclase feldspar and pyroxene)
igneous
Vesicular Basalt
Basalt (Extrusive Igneous Rock)
igneous
Basalt (River Pebble)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt (Vesicular)
Mafic Volcanic Rock (rich in Magnesium and Iron)
Igneous
Basalt (River Pebble)
Extrusive mafic igneous rock
igneous
Vesicular Basalt
Extrusive mafic igneous rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Basalt (Gravel Pebble)
Basalt (contains pyroxene, plagioclase feldspar, and olivine)
igneous
Vesicular Basalt
Basalt (Extrusive Igneous Rock)
igneous
Basalt (Porphyritic)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt (Vesicular and Scoria)
Basalt (extrusive volcanic rock)
igneous
Vesicular Basalt
Extrusive Mafic Igneous Rock
igneous
Basalt (Drill Core)
Mafic Volcanic Rock (Basalt)
igneous
Vesicular Basalt
Mafic Igneous Rock
igneous
Basalt (Polished)
Basalt (Mafic Extrusive Igneous Rock)
Igneous
Basalt (River Stone)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt (River Pebble)
Extrusive mafic igneous rock
igneous
Basalt (Beach Pebble)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt (River Stone)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Amygdaloidal Basalt
Vesicular-Amygdaloidal Basalt (Mafic Extrusive)
igneous
Vesicular Basalt
Extrusive Mafic Igneous Rock with Vesicular Texture
igneous
Vesicular Basalt
Extrusive mafic igneous rock
igneous
Vesicular Basalt
Basalt (SiO2 range 45-52%) with vesicular texture
igneous