Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Category
Metamorphic And Sedimentary
Browse metamorphic and sedimentary specimens identified by the Rock Identifier community.
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Greenstone
Metamorphosed Mafic Igneous Rock
metamorphic
Banded Onyx (Green Onyx)
Banded Calcite or Travertine (CaCO3)
Sedimentary
Gneiss
Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)
metamorphic
Ruby
Corundum (Al2O3 with chromium impurities)
mineral
Banded Gneiss (River Cobble)
Gneiss (a high-grade metamorphic rock)
metamorphic
Greenschist
Greenschist facies rock
Metamorphic
Apatite
Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))
mineral
Quartz River Pebbles
Silicon Dioxide (SiO2)
sedimentary
Staurolite
Staurolite (Fe2+2Al9Si4O23(OH))
metamorphic
Gneiss
Gneiss (a type of metamorphic rock)
Metamorphic Rock
Epidote
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Garnet Schist
Almandine-Muscovite Schist
metamorphic
Marble
Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).
Metamorphic Rock
Garnet (Almandine/Pyrope series)
Garnet Group - X3Y2(SiO4)3
mineral
Graphite-veined Quartzite
Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)
metamorphic
Gneiss
Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)
metamorphic
Rough Garnet (Almandine)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2)
sedimentary
Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3(OH)4)
Mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Agate
Banded Chalcedony (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Magnetic Hematite (Man-made)
Iron Oxide (Fe2O3) with Barium-Strontium Ferrite
mineral
Hematite
Iron(III) oxide (Fe2O3)
Mineral
White Jade / White Chalcedony
Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2) or Chalcedony (SiO2)
Mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium and/or Vanadium impurities
mineral
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)
mineral
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Metamorphic
Kyanite
Kyanite (Al2SiO5)
Mineral