Red Sandstone
Arenite (primarily Quartz, SiO2, with Iron Oxide cementing agent)
sedimentary
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Primarily Composed Of Minerals) in the encyclopedia
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Mica Schist with Garnet
Garnetiferous Mica Schist
metamorphic
Limonite Pseudomorph after Pyrite
Goethite/Limonite FeO(OH)·nH2O replacing Pyrite FeS2
mineral
Quartz (likely Milky Quartz)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Sandstone with trace fossil
Sandstone, possibly with Skolithos or similar trace fossil
sedimentary
Unakite
Epidotized Granite
metamorphic
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Dyed Blue Quartzite
SiO2 (Silicon Dioxide) with artificial colorants
metamorphic
Unakite
Epidotized Granite
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Granite
Phaneritic intrusive igneous rock (primarily SiO2)
igneous
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Banded Agate (Tumbled)
Cryptocrystalline Quartz (SiO2)
mineral
Red Quartzite
Quartzite (SiO2)
metamorphic
Jasper (Iron-stained Chalcedony)
SiO2 with Fe2O3 (Iron Oxide) impurities
Sedimentary / Mineral (Silica)
Unakite
Epidotized Granite
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt containing Zeolite or Quartz (SiO2/Silicates)
igneous
Schist
Mica Schist
metamorphic
Geode (Unopened)
Silica-rich Concretion (primarily SiO2)
sedimentary
Pink Granite (Alkali Feldspar Granite)
Phaneritic Felsic Igneous Rock (composed primarily of KAlSi3O8, SiO2, and NaAlSi3O8)
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of Orthoclase Feldspar and Quartz)
igneous
Granite
Phaneritic Felsic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Serpentine (Lizardite)
Serpentine subgroup, Mg3Si2O5(OH)4
metamorphic
Blue Sapphire
Corundum (Al2O3)
mineral
Diorite
Intermediate plutonic igneous rock
igneous
Diorite
Intermediate plutonic igneous rock
igneous
Slickenside
Tectonic Fault Scarp Surface
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion / Limonite-stained Siltstone
Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)
sedimentary
Desert Rose (also known as Sand Rose)
Gypsum (CaSO4·2H2O) or Barite (BaSO4) with sand inclusions
mineral
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Granite
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Basalt
Mafic Igneous Rock
igneous
Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary
Tiger's Eye
Silicon dioxide (SiO2) with fibrous inclusions of crocidolite
Mineral