Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Category
Man Made Rock (Technosol)
Browse man made rock (technosol) specimens identified by the Rock Identifier community.
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Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Amphibolite
Amphibolite
metamorphic
River Rock
Siliciclastic rock (water-worn pebble)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Chert (Arrowhead)
Chert (primarily Microcrystalline Silica, SiO2)
sedimentary
Banded Sandstone
Arenite with Liesegang banding (primarily SiO2 with FeO(OH) impurities)
sedimentary
Sandstone
Arenite
sedimentary
Granite
Intrusive Igneous Rock
igneous
Sandstone (Iron-stained)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Granite
Granite
Igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Intrusive Igneous Rock (composed mainly of quartz, alkali feldspar, and plagioclase)
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Granite
igneous
Granite
Felsic Plutonic Igneous Rock
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Granite
Granite (Mainly Quartz: SiO2, Feldspar: KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8, and Mica)
igneous
Quartz Geode
Quartz (Silicon Dioxide - SiO2) within a Chalcedony and Limonite shell
sedimentary
Copper Ore (Malachite and Azurite stained rock)
Copper-bearing rock with secondary copper carbonates
mineral
Quartz Druzy
Crystalline Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal) Bracelet
Silicon Dioxide (SiO2)
gemstone
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive igneous rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Glacial Cobble (likely Granitic or Gneissic)
Granite/Gneiss Glacial Erratic
igneous
Agate Geode with Quartz Druzy
Chalcedony (SiO2) and Quartz (SiO2)
mineral
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Limonite (after Pyrite Pseudomorph)
Limonite (Hydrated Iron Oxide Mixture, FeO(OH)·nH2O)
mineral
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Pink Granite
Phaneritic Intrusive Igneous Rock (Granite)
igneous
Tiger's Iron
Pseudomorphic Quartz Aggregate (contains SiO2 with Fe2O3 and FeOOH)
metamorphic
Weathered granite (feldspathic, iron-stained granite)
Granite; primarily quartz, potassium feldspar, plagioclase feldspar, and minor mica/amphibole. Exact identification is uncertain from a single photograph.
igneous
Jasper Pebble
SiO2 (Microcrystalline Quartz)
sedimentary