Basalt Pebble
Extrusive Mafic Igneous Rock
igneous
Category
Basalt
Browse basalt specimens identified by the Rock Identifier community.
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Basalt with Plagioclase Phenocrysts (Porphyritic Basalt)
Porphyritic Basalt (Mafic volcanic rock)
igneous
Epidote with Quartz/Feldspar
Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) with associated minerals in a host rock
Mineral/Metamorphic rock
Chalcedony (Agate/Carnelian)
Cryptocrystalline Quartz (SiO2)
mineral
Basalt (with possible Calcite/Quartz veining)
Afanitic Mafic Igneous Rock
igneous
Basalt (with possible iron oxide staining)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Basalt (with Brass Inlay)
Basalt (Mafic volcanic rock)
igneous
Basalt (Water-worn)
Aphanitic Mafic Igneous Rock
Igneous
River Stone (likely Basalt or fine-grained Andesite)
Extrusive Igneous Rock (Mafic to Intermediate)
igneous
Basalt (River Pebble)
Extrusive mafic igneous rock
igneous
Basalt (Water-worn Pebble)
Basalt (Mafic volcanic rock)
Igneous
Basalt (Beach Pebble)
Basalt (Aphanitic Mafic Igneous Rock)
Igneous
Basalt (with Porphyritic or Amygdaloidal features)
Mafic Volcanic Rock (Basalt)
igneous
Basalt (potential Glacial Erratic)
Extrusive Mafic Volcanic Rock (Basalt)
igneous
Basalt (tumbled/river-worn)
Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Vesicular Basalt
Basalt (principally Plagioclase and Pyroxene)
igneous
Vesicular Basalt
Aphanitic Mafic Igneous Rock (with vesicles)
igneous
Basalt (Weathered)
Extrusive Igneous Rock (Mafic composition)
igneous
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Basalt with Olivine (Peridot)
Basalt containing (Mg,Fe)2SiO4
igneous
Dyed Agate Geode Slice
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt
Vesicular Basalt (Aphanitic-Vesicular Mafic Rock)
igneous
Basalt with minor mineral crusting
Sideromelane / Extrusive Igneous Rock
igneous
Basalt (with possible fine-grained mineralization)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Vesicular Basalt with Epidote/Amygdaloidal Basalt
Amygdaloidal Basalt (Mg, Fe)2SiO4 + Ca2(Al, Fe)3(SiO4)3(OH)
igneous
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Amygdaloidal Basalt
Basalt with secondary amygdule minerals (likely Epidote or Chlorite)
igneous
Vesicular Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt Pebble
Aphanitic Mafic Volcanic Rock (Basalt)
igneous
Vesicular Basalt
Extrusive mafic igneous rock
igneous
Gray Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
River Rocks (Black)
Various lithologies (e.g., basalt, chert, obsidian for black varieties), mechanically rounded clasts
Sedimentary
Basalt River Pebble
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt with Vesicular Texture
Basalt (SiO2 range 45-52%)
igneous
Basalt (River Pebble)
Extrusive mafic igneous rock
igneous
Porphyritic Basalt
Porphyritic Basalt (Mafic Volcanic Rock)
igneous
Porphyritic Basalt
Porphyritic Basalt with Olivine phenocrysts
igneous
Amygdaloidal Basalt
Basalt with secondary mineral infilling
igneous
Basalt Scoria
Aphanitic basaltic scoria
igneous
Porphyritic Basalt
Porphyritic Basalt (with Plagioclase phenocrysts)
igneous
Amygdaloidal Basalt
Basalt with secondary mineral infilling (SiO2/CO3)
igneous
Porphyritic Basalt
Basalt (SiO2 percentage 45-52%) with phenocrysts
igneous