Shale
Clastic sedimentary rock (primarily clay and silt minerals)
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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Pyritic Gneiss
Metamorphic Gneiss with Pyrite inclusions
metamorphic
Gneiss
Gneiss
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Pink Granite Gneiss
Granitic Gneiss
metamorphic
Granite
Granite (a common rock type, not a single mineral; composed primarily of Quartz, Feldspar (Orthoclase and Plagioclase), and Mica (Biotite and/or Muscovite) and/or Amphibole)
Igneous
Raw Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Quartzite River Rock
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartz Druzy on Matrix (with Copper Mineralization)
Silicon Dioxide (SiO2) with Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O)
mineral
Turquoise in Matrix
Hydrous phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Multi-gemstone Quartz and Fluorite Bracelet
Silicon Dioxide (SiO2) and Calcium Fluoride (CaF2)
mineral
Schist
Schist (primarily mica-schist)
metamorphic
Granite Pebble
Phaneritic Felsic Igneous Rock
igneous
Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Fulgurite
Fulgurite (Lechatelierite-rich variety)
metamorphic
Basalt
Extrusive Mafic Igneous Rock (composed primarily of Plagioclase, Pyroxene, and Olivine)
igneous
Eclogite
Eclogite (Omphacite-Garnet Metamorphic Rock)
metamorphic
Amethyst and Ruby in Zoisite
Silicon Dioxide (SiO2) and Anyolite (Zoisite-Hornblende-Ruby mix)
mineral and metamorphic rock
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Biotite Mica
K(Mg,Fe)3AlSi3O10(OH)2
Mineral in a matrix (likely quartz or feldspar)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Arenite
sedimentary
Milky Quartz (Tumbled Pebble)
Silicon Dioxide (SiO2)
mineral
Rhyolite
Rhyolite (High-silica volcanic rock)
igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Jadeite Jade
Sodium Aluminum Silicate (NaAlSi2O6)
metamorphic
River Rock (Granitic Gneiss)
Foliated Granitic Gneiss
metamorphic
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Sandstone (Pebble/Conglomerate fragment)
Sandstone (clastic sedimentary rock)
Sedimentary Rock
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Tiger's Eye
Pseudomorph of quartz after crocidolite (SiO2)
metamorphic
Migmatite
Migmatite (Mixed metamorphic-igneous rock)
metamorphic
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2), a variety of Actinolite-Tremolite
metamorphic
Greenstone / River Siltstone
Metasedimentary Greenstone (Chlorite-rich Siltstone)
metamorphic
Turquoise
Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
Green Aventurine
Silicon Dioxide (Quartz) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Ruby in Kyanite
Al2O3 (Corundum) in Al2SiO5 (Kyanite-Fuchsite-Quartz)
metamorphic
Botryoidal Chalcedony (Agate/Carnelian)
Chalcedony (SiO2)
mineral