Vesicular Basalt
Basalt with vesicular texture
igneous
Category
Igneous Rock
Browse igneous rock specimens identified by the Rock Identifier community.
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Glacial Cobble (likely Granitic or Gneissic)
Granite/Gneiss Glacial Erratic
igneous
Basalt
Basalt (Igneous Volcanic Rock)
igneous
Gabbro
Plutonic mafic rock
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within metamorphic/igneous matrix
igneous/metamorphic
Porphyry
Porphyritic Rock
igneous
Moonstone
Orthoclase Feldspar (KAlSi3O8)
mineral
Milky Quartz (Quartz Vein)
Silicon Dioxide (SiO2)
mineral
Basalt with Calcite Veins
Basalt (Mafic Volcanic Rock)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Peridotite (Pyroxenite/Serpentinized Dunite)
Ultramafic Rock (consisting primarily of Olivine and Pyroxene)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Labradorite
Labradorite (Ca, Na)(Al, Si)4O8
mineral
Basalt
Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Quartz (Milky Quartz vein fragment)
Silicon Dioxide (SiO2)
mineral
Quartz Druze (Crystalline Quartz)
Silicon Dioxide (SiO2)
mineral
Magnetite Orthorthotropic Rock
Magnetite (Fe3O4)
mineral
Quartz-veined Basalt
Amygdaloidal or Porphyritic Basalt with Silicon Dioxide (SiO2) vein
igneous
Quartz (Milky Quartz / Quartzite)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Basalt
Mafic Igneous Basalt
igneous
Basalt with Iron Oxidation
Mafic Igneous Basalt
igneous
Granite Pebble
Granite (composition of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Basalt (Amygdaloidal)
Amygdaloidal Basalt
igneous
Porphyritic Basalt (Chinese Flower Stone / Chrysanthemum Stone basalt variety)
Porphyritic Basalt containing Plagioclase Feldspar phenocrysts
igneous
Pink Feldspar
Orthoclase Feldspar (KAlSi3O8)
mineral
Milky Quartz
Quartz (Silica / Silicon Dioxide), SiO2
mineral
Olivine (Peridotite)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
igneous
Lapis Lazuli
Lapis Lazuli (Rock containing Lazurite, Calcite, and Pyrite)
metamorphic
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2) and Slate/Shale
mineral
Basalt with Quartz/Calcite Vein
Amygdaloidal Basalt (matrix) with Mineral Vein filling
igneous
Foliated Metamorphic Rock (likely Gneiss or Schist)
Gneissic Metamorphic Rock
metamorphic
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
metamorphic
Pumice
Pumice (volcanic rock)
Igneous
Basalt
Basalt (Igneous Volcanic Rock)
igneous
River Cobble (Basaltic/Andesitic)
Mafic Igneous Porphyritic Rock
igneous
Biotite (Black Mica)
Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)
mineral
Basalt
Basalt (Extrusive Mafic Igneous)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous