Quartzite
Quartzite (primarily SiO2)
metamorphic
Category
Metamorphic (Low Grade)
Browse metamorphic (low grade) specimens identified by the Rock Identifier community.
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Rhodonite with Manganese Oxides
Rhodonite (Mn,Fe,Mg,Ca)SiO3
metamorphic
Calcite
Calcium Carbonate (CaCO3)
mineral
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron traces)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Lapis Lazuli
Lazurite-dominated contact metamorphic rock
metamorphic
Lapis Lazuli
Lapis Lazuli (Complex aggregate of Lazurite, Calcite, and Pyrite)
metamorphic
Emerald
Beryl (Be3Al2(SiO3)6) with trace Chromium/Vanadium
mineral
Smoky Quartz and Clear Quartz Geode
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Rough Dark Green Sapphire
Corundum (Al2O3)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Citrine (Quartz variant)
SiO2 (Silicon Dioxide)
mineral
Garnet (Almandine)
Almandine, Fe3Al2(SiO4)3
metamorphic
Blue Sapphire
Corundum (Al2O3)
mineral
Schist
Schist (various mineral compositions)
metamorphic
Citrine Quartz
Citrine (Silicon Dioxide, SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Coal (most likely Bituminous or Anthracite)
Coal (organic sedimentary rock)
Sedimentary
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (pronounced "nice")
metamorphic
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Staurolite (Fairy Stone)
Staurolite (formula: Fe2+2Al9Si4O23(OH))
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Amethyst
Amethyst (Silicon Dioxide with iron impurities, SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Chrysocolla
Hydrated copper phyllosilicate, Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)
mineral
Lapis Lazuli
Lapis Lazuli (Complex aggregate including Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Fossiliferous Shale or Slate with Plant Fossils
Fossil-bearing argillaceous rock
Sedimentary/Metamorphic
Tumbled Moonstone and Amazonite Chips
Orthoclase (KAlSi3O8) and Microcline (KAlSi3O8) of the Feldspar Group
mineral
Carnelian
Carnelian (a variety of Chalcedony, SiO ₂)
Mineral (specifically a variety of Chalcedony, which is a cryptocrystalline quartz)
Clear Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Caliche (also known as hardpan, calcrete, kankar)
Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.
Mineral
Beryl (likely Aquamarine) in matrix
Be3Al2(SiO3)6 (Beryllium Aluminum Silicate)
mineral
Lapis Lazuli
Complex mixture of minerals (lazurite, calcite, pyrite, and sodalite); (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Moonstone
Orthoclase Feldspar (composed of alternate layers of orthoclase and albite), (K,Na)AlSi3O8
mineral