Sandstone (Quartz Sandstone / Iron-stained Sandstone)
Sandstone (SiO2 with iron oxide impurities)
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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Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite
Intrusive Igneous Rock (composed primarily of quartz, alkali feldspar, and plagioclase)
igneous
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Green Mica Schist
Mica Schist (Fuchsite or Chlorite variety)
metamorphic
Quartz vein in Schist
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
metamorphic
Granitic gneiss (weathered, rounded cobble)
Foliated granitoid; primarily quartz, feldspar, and mica (composition commonly approximates granite)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Blue Quartzite
Metamorphic Rock (rich in Quartz, SiO2 with inclusions of Dumortierite or Magnesio-riebeckite)
metamorphic
Granite Cobble
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Serpentinite
Serpentinite (composed mainly of Serpentine-group minerals: (Mg, Fe)3Si2O5(OH)4)
metamorphic
Common Quartz Pebble
Silicon dioxide (SiO2) rock fragment
sedimentary
Gneiss (High-grade Metamorphic Rock)
Gneiss
metamorphic
Mica Schist with Quartz
Muscovite/Biotite Schist
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)
igneous
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Mica Schist
Mica Schist
metamorphic
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Mica Schist
Mica Schist (primarily composed of Muscovite/Biotite)
metamorphic
Greenschist (Greenstone)
Chlorite Schist / Greenschist Facies Rock
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Greenschist
Greenschist (Chlorite-actinolite schist)
metamorphic
Schist (specifically Mica Schist)
Mica Schist (primarily composed of Muscovite KAl2(AlSi3O10)(OH)2 and Biotite)
metamorphic
Marble
Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).
Metamorphic Rock
Granite
Phaneritic Felsic Igneous Rock
igneous
Sandstone
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Siltstone
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Glaucophane / Blue Schist
Glaucophane (Na2(Mg3Al2)Si8O22(OH)2)
metamorphic
Schist
Mica Schist (Medium-grade metamorphic rock)
metamorphic
Marble (Sculpted Statue)
Metamorphic Limestone (composed primarily of Calcite, CaCO3)
metamorphic
Not a geological specimen
N/A (man-made object)
N/A
Greenstone / Epidosite
Metamorphosed Mafic Igneous Rock (Epidote-Chlorite group)
metamorphic
![Lapis Lazuli (Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)₈[(S,Cl,SO₄,OH)₂|(Al₆Si₆O₂₄)], with varying amounts of Calcite, Pyrite, and Sodalite.)) — Mineral](https://media.rockidentification.com/ac5a19c1-d5b9-4c2e-8fab-285264802654-thumbnail.jpg)
Lapis Lazuli
Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)₈[(S,Cl,SO₄,OH)₂|(Al₆Si₆O₂₄)], with varying amounts of Calcite, Pyrite, and Sodalite.)
Mineral
Greenstone
Metabasalt / Greenschist facies rock
metamorphic
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Anyolite (Ruby in Zoisite)
Zoisite with inclusions of Hornblende and Ruby (Ca2Al3(SiO4)3(OH))
metamorphic
Serpentinite
Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)
Metamorphic Rock
Granite Pebble
Granite
igneous
Sandstone
Arenite (composed primarily of Quartz, SiO2)
sedimentary