Porphyritic Basalt
Porphyritic Basalt (containing Plagioclase phenocrysts)
igneous
Category
Basalt
Browse basalt specimens identified by the Rock Identifier community.
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Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Amygdaloidal Basalt
Amygdaloidal Mafic Volcanic Rock (Basalt)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Ca-rich Plagioclase, Pyroxene, and Olivine)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Amygdaloidal Basalt
Amygdaloidal Mafic Volcanic Rock
igneous
Porphyritic Basalt
Porphyritic Mafic Volcanic Rock
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Extrusive volcanic rock)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Porphyritic Basalt
Basalt (with plagioclase or k-feldspar phenocrysts)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (extrusive volcanic rock with secondary mineral infilling)
igneous
Porphyritic Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Porphyritic Basalt
Porphyritic Basalt (containing Plagioclase phenocrysts)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Basalt (Vesicular)
Extrusive mafic igneous rock; primarily (Ca, Na)(Mg, Fe, Al)(Si, Al)2O6 with (Ca, Na)(Al, Si)4O8
igneous
Pahoehoe Basalt
Extrusive mafic volcanic rock
igneous
Amygdaloidal Basalt
Vesicular Basalt with secondary mineral infilling (commonly Zeolites, Calcite, or Quartz)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock including secondary mineral infills)
Igneous
Amygdaloidal Basalt
Basalt with secondary mineral infilling (commonly SiO2 or Zeolites)
igneous
Porphyritic Basalt
Aphanitic-porphyritic mafic volcanic rock
igneous
Peridot (Olivine)
Olivine ((Mg, Fe)2SiO4)
mineral
Olivine (Peridot when gem-quality)
Olivine Group (Magnesium Iron Silicate, (Mg,Fe)2SiO4)
mineral
Olivine (Dunite)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
igneous
Copper Nugget
Native Copper (Cu)
mineral
Prehnite
Prehnite, Ca2Al(AlSi3O10)(OH)2
mineral
Basalt with Quartz Vein
Basalt (SiO2 vein inclusion)
igneous
Porphyritic Basalt (with Pyrolusite or Iron-oxide staining)
Porphyritic Basalt (Mafic Extrusive)
igneous
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)
igneous
Basalt (with Iron Staining)
Mafic Igneous Rock
igneous
Basalt (Vesicular)
Aphanitic Mafic Volcanic Rock
igneous
Vesicular Basalt / Scoria
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Vesicular Basalt
Vesicular Basalt (rich in silicate minerals mostly Plagioclase and Pyroxene)
igneous
Vesicular Basalt
Amygdaloidal Basalt (Mafic extrusive volcanic rock)
Igneous
Basalt (Vesicular)
Extrusive Mafic Igneous Rock
igneous
Vesicular Basalt
Basalt (Mafic volcanic rock)
igneous
Vesicular Basalt
Vesicular Basalt (Aphanitic Mafic Rock)
igneous
Vesicular Basalt
Extrusive Mafic Igneous Rock (Vesicular Basalt)
igneous
Scoria
Vesicular Basaltic Glass
igneous
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Agate
Banded Chalcedony (SiO2)
mineral
Chalcedony (Botryoidal/Tumbled Agate)
Silicon Dioxide (SiO2)
mineral
Porphyritic Basalt (Chinese Writing Stone)
Porphyritic Basalt with Feldspar Phenocrysts
igneous