Magnetite Orthorthotropic Rock
Magnetite (Fe3O4)
mineral
Category
Mineral On Igneous Rock
Browse mineral on igneous rock specimens identified by the Rock Identifier community.
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Small rough mineral/rock fragment
Indeterminate; possibly quartz-bearing rock or weathered feldspar
mineral
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Mixed Rock Collection (Pebbles and Stones)
Various geological specimens
igneous, sedimentary, and metamorphic
Black Beauty Meteorite
NWA 7034 (Northwest Africa 7034)
igneous
Hypersthene
Hypersthene ((Mg,Fe)SiO₃)
Mineral
Granite Pebble
Phaneritic intrusive igneous rock
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Phaneritic intrusive igneous rock
igneous
Gneiss (rounded cobble)
Quartz–feldspar–mica gneiss; exact mineral proportions cannot be determined from the image
metamorphic
Gneiss and Igneous Rock Collection
Foliated Metamorphic Rock (Gneiss) / Igneous Rocks
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Granite
Intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Dark Igneous Rock (Likely Basalt or Diabase)
Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.
Igneous
Granite-like rock
Felsic intrusive igneous rock, probably granitic or granodioritic
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Phaneritic Igneous Rock (Granite)
igneous
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Granite
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Granite
Granite (Plutonic Igneous Rock)
igneous
Angular gray rock fragments
Unidentified fine-grained rock; the image does not show diagnostic features sufficient for a specific identification
igneous
Rhyolite
Extrusive igneous rock (felsic)
igneous
Clear Quartz
Silicon dioxide (SiO2)
mineral
Likely garnet crystal fragment
Garnet-group mineral, possibly almandine (Fe₃Al₂(SiO₄)₃)
mineral
Basalt
Extrusive Igneous Rock
igneous
Granodiorite
Intrusive Igneous Rock
igneous
Granite
Intrusive igneous rock
igneous
Glacial Cobble with Granite Inclusion
Porphyritic Basalt or Andesite containing Granitic Xenolith
igneous
Dalmatian Stone
Peralkaline Feldsphathic Igneous Rock
igneous
Likely blue-gray gneiss
Gneiss, a foliated metamorphic rock; exact mineral composition cannot be confirmed from the image
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Pink granite
Granite, chiefly quartz, potassium feldspar, and plagioclase with minor mica
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic Plutonic Igneous Rock
igneous
Obsidian
Volcanic Glass (SiO2 with impurities)
igneous
Weathered granite or granitic gneiss
Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded
igneous
Basalt
Mafic Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
River Rock with Quartz Vein
Basalt or Andesite with Quartz Veining
igneous
Xenolith in Basalt
Mafic Igneous Rock with Felsic Inclusion
igneous