Basalt
Basalt
igneous
Category
Igneous Rock (Volcanic Glass)
Browse igneous rock (volcanic glass) specimens identified by the Rock Identifier community.
Learn about Igneous Rock (Volcanic Glass) in the encyclopedia
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Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Vesicular volcanic rock, likely pumice or scoriaceous rhyolite
Vesicular rhyolite/dacite; predominantly silica-rich volcanic glass with feldspar and quartz
igneous
Vesicular volcanic rock, possibly weathered basalt or scoria
Basaltic scoria/vesicular basalt; predominantly plagioclase, pyroxene, and iron-titanium oxides
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix
metamorphic
Basalt with Alteration Crust
Basalt (SiO2 range 45-52%)
igneous
Wonderstone (Banded Rhyolite)
Rhyolite (Silicon Dioxide with Iron Oxide impurities)
igneous
Basalt Pebble
Extrusive Igneous Rock
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt (Vesicular)
Vesicular Basalt
igneous
Peridot in Basalt
Olivine ((Mg, Fe)2SiO4) in Basalt
mineral
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Obsidian
Obsidian (principally SiO2)
igneous
Basalt Pebble
Extrusive Igneous Rock
igneous
Amethyst
Crystalline Quartz (SiO2) with iron impurities
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Matrix
igneous/metamorphic
Basalt with Chert/Obsidian blade
Aphanitic Mafic Igneous Rock (Basalt) with Microcrystalline Silica (Chert)
igneous
Dalmatian Jasper
Peralkaline Quartz-Feldspar Porphyritic Rock (Dalmatian Stone)
igneous
Scoria
Extrusive Igneous Rock
igneous
Scoria (Red Lava Rock)
Scoria (Aphanitic-Vesicular Mafic Rock)
igneous
Quartz (White/Milky with Iron Staining)
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt (Scoria)
Basalt (Vesicular texture)
igneous
Basalt
Basalt
igneous
Pumice
Highly vesicular volcanic glass (unnamed scientific variant: Rhyolitic/Andesitic Pumice)
igneous
Vesicular basalt (possibly amygdaloidal basalt)
Basalt, chiefly plagioclase feldspar and pyroxene, with possible olivine and secondary mineral infillings
igneous
Basalt with olivine (Porphyritic Basalt)
Mafic Igneous Volcanic Rock (Extrusive Basalt)
igneous
Vesicular Basalt with Siltstone
Mafic Volcanic Rock (Basaltic Composition)
igneous
Basalt (Lava Rock) and Dyed Glass/Quartz
Scoria (Vesicular Basalt)
igneous
Chalcedony (Agate/Carnelian precursor)
Chalcedony (Silicon Dioxide, SiO2)
mineral
Porphyry (Rhyolite / Andesite Porphyry Pebble)
Porphyritic Igneous Rock
igneous
Amygdaloidal Rhyolite
Rhyolite (felsic volcanic rock) with amygdules
igneous
Basalt (Water-worn)
Aphanitic Mafic Igneous Rock
Igneous
Rhyolite with Agate/Quartz Vugs
Rhyolite (Volcanic Rock) containing SiO2 (Silica) vugs
igneous
Obsidian (Arrowhead Lithic Tool)
Obsidian (Amorphous Volcanic Glass / SiO2 + inclusions)
igneous
Pumice
Pumice (a highly vesicular amorphous silicate glass)
igneous
Basalt Pebble
Extrusive mafic igneous rock
igneous
Tumbled Agate
Silicon Dioxide (Chalcedony variety), SiO2
mineral
Basalt with Phenocrysts
Porphyritic Basalt
igneous
Unknown Rock Specimen
igneous
Unidentified weathered rock fragment
Likely granitic or feldspathic rock; exact identification requires clearer imaging and testing
igneous
Basalt (Vesicular)
Vesicular Basalt
igneous