Blue Agate Geode Slice
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Category
Mineral Like (Natural Glass)
Browse mineral like (natural glass) specimens identified by the Rock Identifier community.
Learn about Mineral Like (Natural Glass) in the encyclopedia
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Opalite
Man-made opalescent glass
gemstone
Polished Black Onyx (or Obsidian)
Silicon Dioxide (SiO2)
mineral
Pumice
Vesicular volcanic glass (primarily SiO2)
igneous
Pearls
Pearl: biomineralized aragonite (CaCO₃) and conchiolin
gemstone
Dragon Vein Agate (Dyed/Fractured Quartz)
Silicon dioxide (SiO2)
gemstone
Carnelian/chalcedony rough
Microcrystalline quartz (SiO₂), iron-oxide-colored chalcedony
mineral
Diamond (or Diamond Simulant like Cubic Zirconia)
Carbon (C) - if Diamond; Zirconium dioxide (ZrO2) - if Cubic Zirconia
mineral
Pink Sapphire
Corundum (Al2O3 with trace Chromium and Iron)
mineral
Magnetite or Magnetic Iron Ore
Magnetite (Fe3O4)
mineral
Lapidary Wax (imitation/wax model)
Hydrocarbon wax blend with colorant (imitating Lapis Lazuli/Emerald)
mineral
Blue Sapphire (Raw/Tumbled Corundum)
Corundum (Aluminum Oxide, Al2O3 with Fe/Ti traces)
mineral
Peacock Ore (Bornite or Chalcopyrite)
Bornite (Cu5FeS4) or Acid-Washed Chalcopyrite (CuFeS2)
mineral
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
Mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Chert (Jasper/Common Opal mix)
Microcrystalline Quartz (SiO2)
sedimentary
Diamond (or Diamond Simulant/Cubic Zirconia)
Carbon (C) - if diamond, or Zirconium dioxide (ZrO2) - if Cubic Zirconia
mineral
Sandstone pebble
Sandstone (Quartz-rich Arenite)
sedimentary
Sandstone
Sedimentary rock composed mainly of quartz sand
sedimentary
Opalite
Synthetic Opalised Glass
mineraloid (synthetic)
Concrete
Anthropogenic Conglomerate
sedimentary
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Granite Pebble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Yellow Quartz (Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary
Moldavite
Tektite (Silicates with aluminum, iron, manganese, and potassium oxide glass)
meteorite
Ruby and Sapphire Cluster Ring
Corundum (Al2O3)
gemstone
Green Aventurine
Quartz (Silicon Dioxide with Fuchsite inclusions - SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Aventurine
SiO2 (Silicon Dioxide with Fuchsite inclusions)
mineral
Ferruginous Sandstone (Red Sandstone)
Arenite with Hematite/Limonite cement
sedimentary
Green Aventurine
Aventurine Quartz (SiO2 with inclusions)
metamorphic
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone Flagstone
Arenite (SiO2 with various cementing agents)
sedimentary
Dyed Agate
Silicon Dioxide (SiO2) with synthetic dyes
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Shale fragment
Shale (clay mineral rich sedimentary rock)
sedimentary
Green Aventurine
Aventurine Quartz (SiO2 + Fuchsite mica)
Mineral
Blue Topaz (Cut Gemstone)
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
gemstone
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral