Basalt
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
Category
Browse mineral on igneous rock specimens identified by the Rock Identifier community.
Basalt
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
Quartz Pebble
Silicon Dioxide (SiO2)
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
Serpentinite
Serpentinite (composed primarily of serpentine group minerals like lizardite, chrysotile, or antigorite; Mg3Si2O5(OH)4)
Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
Basalt
Mafic igneous rock (primarily Plagioclase feldspar and Pyroxene)
Sandstone
Arenite (SiO2 dominant)
Basalt Pebble
Extrusive mafic igneous rock; primarily (Ca, Na)(Mg, Fe, Al)Si2O6 and (Ca, Na)AlSi3O8
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
Basalt
Basalt (Mafic Extrusive Igneous Rock)
River Agate (Chert/Chalcedony)
Cryptocrystalline Quartz (SiO2)
Pyrite
Pyrite (Iron Disulfide), FeS2
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Gneiss
Gneiss (High-grade regional metamorphic rock)
Dalmatian Stone
Dalmatian Jasper (Aplitic Perthite)
Granite with Biotite and Quartz
Phaneritic Felsic Igneous Rock (composed of SiO2, KAlSi3O8, and K(Mg,Fe)3AlSi3O10(OH)2)
Magnetite / Iron Ore
Magnetite (Fe3O4)
Basalt
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
Green Opal
Hydrated Silica (SiO2·nH2O)
Scoria (Vesicular Basalt)
Vesicular Basalt
Black Obsidian
Obsidian (Volcanic glass), 70–75% SiO2
Quartz
Quartz (SiO₂)
Magnetite
Magnetite (Fe3O4)
Basalt
Extrusive Mafic Igneous Rock (composed primarily of Plagioclase, Pyroxene, and Olivine)
Chinese Writing Stone
Porphyritic Basalt or Porphyritic Andesite with Feldspar phenocrysts (SiO2-rich Silicates)
Basalt (Vesicular)
Basalt (Mafic Extrusive Igneous Rock)
Basalt
Basalt (Mafic Extrusive Igneous Rock)
Pink Granite
Phaneritic Felsic Igneous Plutonic Rock
Pink Granite (Crystalline Granite)
Igneous Intrusive Rock (Felsic Plutonic)
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
Diorite
Diorite (Intermediate intrusive igneous rock)
Diorite
Diorite (intermediate intrusive igneous rock)
Granite
Granite (Phaneritic Acidic Igneous Rock)
Venetian Gold Granite
Phaneritic Felsic Igneous Rock (Granite)
Basalt
Basalt (Aphanitic extrusive igneous rock)
Pink Granite (Water-worn Cobble)
Phaneritic Felsic Intrusive Igneous Rock
Pink Granite
Phaneritic intrusive felsic igneous rock
Granite
Granite (Felsic intrusive igneous rock)
Diorite
Diorite (Intermediate intrusive igneous rock)
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
Granite
Phaneritic Intrusive Igneous Rock (Granite)