Ruby (Corundum)
Al2O3 (Aluminium oxide with Chromium 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.
Conglomerate (Red Sandstone variety)
Clastic Sedimentary Rock (Conglomeratic Sandstone)
sedimentary
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Silty Sand / Loam
Unconsolidated Clastic Sediment (Silicon Dioxide / Alumino-silicates mixture)
sedimentary
Milky Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (Red Sandstone)
Arenite (SiO2 based with Fe2O3 staining)
sedimentary
Siltstone
Siltstone (primarily SiO2 with Al2O3)
sedimentary
Quartzite Pebble (River Rock)
Quartzite (SiO2)
metamorphic
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Raw Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Quartzite (River Cobble)
Quartzite (Metamorphosed Quartz Sandstone, SiO2)
metamorphic
Quartzite with Hematite
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 inclusions)
metamorphic
Sandstone (likely Graywacke or Lithic Sandstone)
Clastic Sedimentary Rock
sedimentary
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Chert (with Fossiliferous Silicification)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (Iron-rich)
sedimentary
Asphalt (Road Aggregate)
Bituminous Conglomerate / Asphalt Concrete
Anthropogenic (Man-made)
Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
sedimentary
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Sandstone
Arenite
sedimentary
Conglomerate
Conglomerate (Detrital sedimentary rock)
sedimentary
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Rough Emerald/Green Beryl
Beryl (Be3Al2(SiO3)6) with trace amounts of Chromium or Vanadium
mineral
Zoisite with Ruby
Anyolite (Ca2Al3(SiO4)3(OH) with Al2O3:Cr)
metamorphic
Pyrite
Iron Pyrite (FeS2)
Mineral
Quartzite (Gold-Yellow variety)
Quartzite (Silicon Dioxide, SiO2)
metamorphic
Quartzite River Cobble
Quartzite (primarily SiO2)
metamorphic
Jade (Nephrite and Jadeite)
Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2; Jadeite: NaAlSi2O6
metamorphic
Quartz (Smoky/Grey variety)
Silicon Dioxide (SiO2)
mineral
Rough Garnet (Almandine)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Soapstone / Steatite
Steatite (primarily Talc, Mg3Si4O10(OH)2)
metamorphic
Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia)
Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy
Mineral (synthetic) and Metal (precious/base)
Basalt (Crushed Stone)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Anthracite Coal
Anthracite (Carbon-based metamorphic rock, 86-97% C)
metamorphic
Desert Rose
Selenite Rose (Gypsum: CaSO4·2H2O)
mineral
Ruby
Corundum (Al2O3) with Chromium traces
mineral
Schorl (Black Tourmaline)
NaFe3Al6Si6O18(BO3)3(OH)3OH (Iron tourmaline)
mineral
Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)
Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)
sedimentary
Tourmaline (Schorl or Dravite) on Matrix
Complex Borosilicate - Na(Mg,Fe,Li,Al,Mn)3Al6(BO3)3Si6O18(OH,F)4
mineral