Ruby
Corundum (Al2O3 with Chromium trace impurities)
mineral
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
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Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Mica Schist
Mica Schist (Complex Silicate Rock)
metamorphic
Biotite Schist
Metamorphic Rock (Schist)
metamorphic
Beryl (likely Aquamarine) in matrix
Be3Al2(SiO3)6 (Beryllium Aluminum Silicate)
mineral
Garnet (Red Garnet)
Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).
Mineral (specifically, a variety of the mineral species Pyrope-Almandine Garnet)
Schist
Mica Schist
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Garnet Schist
Almandine Garnet Schist
metamorphic
Gneiss
High-grade foliated metamorphic rock
metamorphic
Garnet Schist
Almandine-Muscovite Schist
metamorphic
Quartz Vein in Schist
Quartz (SiO2) in Pelitic Schist
metamorphic
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Marble
Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)
metamorphic
Greenstone (Epidosite or Serpentinite)
Metabasalt / Epidote-Chlorite Schist
metamorphic
Quartzite with Feldspar and Mica (Granitic Gneiss Pebble)
Metamorphic Rock / Quartzite / Granitic Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Mica Schist
Mica-rich Schist containing Muscovite and Quartz
metamorphic
Rough Corundum (likely Sapphire/Zircon-bearing)
Aluminium Oxide (Al2O3)
mineral
Gneiss
Banded Gneiss
metamorphic
Gneiss (Metamorphic Rock)
Gneiss (high-grade regional metamorphic rock)
metamorphic
Glaucophane Schist (Blueschist)
Blueschist (Glaucophane-bearing schist)
metamorphic
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Schist
Mica Schist
metamorphic
Emerald in Matrix
Emerald (variety of Beryl) - Be3Al2(SiO3)6
mineral
Staurolite-bearing mica schist (probable)
Mica schist composed chiefly of muscovite/biotite, quartz, and likely staurolite or garnet
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Banded Gneiss and Siltstone River Stones
Gneiss (High-grade Metamorphic Rock)
metamorphic
Quartz
Quartz (SiO₂)
Mineral
Gneiss
Gneiss (Metamorphic high-grade)
metamorphic
Fuchsite Schist
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Schist
metamorphic
Riverstone Quartzite (Water-worn Siltstone/Quartzite)
Metamorphosed Quartz-rich Arenite (SiO2)
metamorphic
Gneiss
Gneiss
metamorphic
Schist
Mica Schist (variety: Muscovite/Biotite Schist)
metamorphic
Mica Schist
Metamorphic Rock (rich in Muscovite or Biotite mica)
metamorphic
Gneiss
Gneiss (Metamorphic high-grade)
metamorphic
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock