Granite Boulder
Intrusive Igneous Rock
Category
Browse mineral on igneous rock specimens identified by the Rock Identifier community.
Granite Boulder
Intrusive Igneous Rock
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
Basalt
Extrusive Igneous Rock
Dark mafic igneous rock, likely basalt or gabbro
Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine
Black Obsidian
Volcanic Glass (Amorphous SiO2 with trace impurities)
Porphyry
Porphyritic Igneous Rock
Porphyry
Porphyritic Igneous Rock
Quartz / Quartzite
Silicon Dioxide (SiO2)
Granite Pebble
Intrusive igneous rock (Quartz, Feldspar, Mica)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Vein Quartz in Basalt or Mafic Rock
Silicon Dioxide (Quartz veins in volcanic host rock)
Granite
Felsic intrusive igneous rock
River Cobble (Weathered Granitoid)
Granodiorite / Quartz Diorite
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
Granite
Intrusive igneous rock
Basalt
Mafic Igneous Rock
Basalt with Vesicular Amygdule
Extrusive igneous rock (Mafic)
Granite
Intrusive Igneous Rock
Basalt
Extrusive igneous rock
Pegmatite (Quartz, Feldspar, and Tourmaline/Biotite)
Pegmatitic Igneous Rock
Granite
Phaneritic plutonic rock (SiO2 rich)
Clear Quartz (Faceted)
Silicon Dioxide (SiO2)
Dalmatian Jasper
Peralkaline Feldspar Diorite/Rhyolite
Granite
Intrusive igneous felsic rock
Granite
Intrusive Igneous Rock
Quartz Crystal Cluster on Matrix
Silicon Dioxide (SiO2)
Quartz Vein in Basalt or Porphyry
Silicate-veined volcanic rock
Granite Pebble
Granite
Massive Quartz with Host Rock
Silicon Dioxide (SiO2)
Vesicular Basalt (Scoria)
Basalt with vesicular texture
Granite
Felsic intrusive igneous rock
Rhyolite with Lithophysae and Iron Oxide
Extrusive igneous rock / Felsic volcanic rock
Granite
Felsic intrusive igneous rock
Granite
Felsic intrusive igneous rock
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
Granite
Phaneritic intrusive igneous rock
Ocean Jasper
Orbicular Jasper / Silicate
Quartz (Smoky/Granular variety)
Silicon Dioxide (SiO2)
Epidote with Quartz/Feldspar
Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) with associated minerals in a host rock
Granite
Felsic intrusive igneous rock
Dalmatian Jasper
Aplite with Arfvedsonite inclusions
Granite / Feldspar gravel
Granite (felsic intrusive igneous rock)