Granite
Granite (Mainly Quartz: SiO2, Feldspar: KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8, and Mica)
Category
Browse mixed: igneous and sedimentary specimens identified by the Rock Identifier community.
Granite
Granite (Mainly Quartz: SiO2, Feldspar: KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8, and Mica)
Porphyry
Porphyritic Rock
Olivine (in Peridotite/Dunite form)
Magnesium Iron Silicate (Mg,Fe)2SiO4
Basalt with Iron Oxidation
Amygdaloidal Basalt (silicate rock primarily plagioclase, pyroxene, and olivine)
Basalt
Basalt (Aphanitic mafic volcanic rock)
Basalt
Basalt (Mafic volcanic rock)
Basalt
Basalt (composition mainly of Plagioclase feldspar, Pyroxene, and Olivine)
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
Olivine in Basalt
Peridotite / Forsterite ((Mg,Fe)2SiO4)
Scoria (Lava Rock)
Scoria
Granite Pebble
Granite
Pink Granite
Phaneritic Acidic Igneous Rock (primarily SiO2, Al2O3, K2O)
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
Basalt
Extrusive mafic igneous rock
Granite
Granite (Felsic Plutonic Rock)
Basalt
Basalt (composition of plagioclase, pyroxene, and olivine)
Basalt
Basalt (Mafic Extrusive)
Basalt
Basalt (Mafic Extrusive Igneous Rock)
Basalt (Arrowhead form)
Extrusive mafic igneous rock
Basalt with Vesicle/Vug
Basalt (Aphanitic Mafic Igneous Rock)
Basalt
Basalt (Aphanitic-to-porphyritic mafic volcanic rock)
Basalt
Basalt
Basalt
Basalt (Volcanic Mafic Rock)
Basalt Pebble
Basalt (Mafic Extrusive Igneous Rock)
Basalt
Basalt (SiO2 percentage between 45% and 52%)
Basalt (Weathered Pebble)
Extrusive mafic rock (primarily Plagioclase Feldspar and Pyroxene)
Diorite
Diorite
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
Granite Pegmatite with Muscovite Mica
Granite Pegmatite (Silicon Dioxide and complex silicates)
Gabbro
Gabbro (Mg, Fe)2Si2O6 / CaAl2Si2O8
Granite Pegmatite
Phaneritic Felsic Igneous Rock (Granite)
Granite Cobble
Phaneritic Felsic Igneous Rock
Diorite (River Pebble)
Phaneritic Intermediate Plutonic Rock (Diorite)
Obsidian
Obsidian (Volcanic Glass, SiO2)
Diorite
Diorite (intermediate intrusive igneous rock)
Basalt
Basalt (Fine-grained extrusive igneous rock)
River Pebble (Gabbro or Basalt)
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
Granite
Phaneritic plutonic rock (Quartz, Alkali Feldspar, and Plagioclase)
Diorite (River Pebble)
Intermediate plutonic igneous rock
Granite
Granite (Phaneritic Igneous Rock / Quartz, Feldspar, Mica)
Basalt
Mafic Extrusive Igneous Rock
Diorite
Diorite (Intermediate intrusive igneous rock)