Basalt
Mafic volcanic rock
igneous
Category
Igneous
Browse igneous specimens identified by the Rock Identifier community.
Learn about Igneous in the encyclopedia
View all →
Granite Pebble
Granite (Felsic Plutonic Rock)
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Diorite
Diorite (Plagioclase feldspar and Hornblende/Biotite)
igneous
Granite
Phaneritic Plutonic Rock (Granite)
igneous
Pink Granite
Phaneritic Plutonic Rock (Felsic)
igneous
Graphic Granite
Pegmatite (Quartz and Alkali Feldspar intergrowth)
igneous
Basalt
Basalt
igneous
Porphyritic Andesite
Andesite with Hornblende phenocrysts
igneous
Basalt with Plagioclase Phenocrysts
Basalt
igneous
Porphyry
Porphyritic Basalt or Andesite
igneous
Granite
Phaneritic plutonic rock (SiO2-rich)
igneous
Pegmatite with Black Tourmaline
Granitic Pegmatite with Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
igneous
Amygdaloidal Basalt with Agate/Quartz Infill
Basalt with Secondary Silicate Mineralization (SiO2)
igneous
Obsidian
Volcanic Glass (mostly SiO2)
igneous
Diorite with Weathering Rind
Course-grained intermediate plutonic rock (Diorite)
igneous
Basalt with Olivine Phenocrysts
Aphanitic Mafic Volcanic Rock (Basalt)
igneous
Andesite
Andesite (Intermediate Volcanic Rock)
igneous
Basalt (River Pebble)
Basalt
igneous
Porphyritic Basalt (Flower Stone)
Basalt with Feldspar phenocrysts
igneous
Basalt Scoria
Aphanitic basaltic scoria
igneous
Yooperlite (Fluorescent Sodalite-bearing Syenite)
Sodalite-bearing Syenite
igneous
Slag (Industrial Glass/Glassy Rock)
Anthropogenic Vitreous Material
igneous
Obsidian Jewelry Piece
Volcanic Glass (SiO2 + impurities)
igneous
Beach Pebble (likely Basalt or Chert)
Volcanic Basalt / Microcrystalline Quartz
igneous
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Porphyritic Basalt
Porphyritic Basalt (with Plagioclase phenocrysts)
igneous
Black Obsidian
Volcanic Glass (Silicon Dioxide with impurities)
igneous
Granite Pebble
Granite (Felsic Plutonic Rock)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Basalt
Mafic volcanic rock (formula mostly SiO2, MgO, FeO)
igneous
Basalt Beach Pebble
Basalt (Mafic volcanic rock)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
River Cobble (Diorite or Meta-volcanic with Quartz Veining)
Diorite (with SiO2 quartz veins)
igneous
Scoria (Lava Rock)
Scoria
igneous
Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (70–75% SiO2)
igneous
Ocellar Rhyolite
Rhyolite (featuring orbicular/ocellar quartz and feldspar textures)
igneous
Basalt
Basalt
igneous
Scoria (Lava Rock)
Scoria
igneous
Vesicular Basalt
Basalt (extrusive volcanic rock)
igneous
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Basalt River Stone
Basalt (Aphanitic Mafic Volcanic Rock)
igneous