Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
Category
Browse synthetic glass (man made) specimens identified by the Rock Identifier community.
Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
Sandstone (likely Quartzose Sandstone)
Arenite
Sandstone
Sedimentary Rock (Quartz arenite)
Larimar
Pectolite (NaCa2Si3O8(OH))
Chert / Flint
Microcrystalline Quartz (SiO2)
Diamond
Carbon (C)
Diamond
Carbon (C)
Diamond
Carbon (C)
Rough Corundum (Sapphire/Ruby mixture)
Corundum (Aluminum Oxide, Al2O3)
Diamond (Colorless/White)
Carbon (C)
Flint / Chert
Microcrystalline quartz (SiO2)
Quartzite
Metamorphic Quartzite (SiO2)
Magnetite or Hematite-rich Ore
Magnetite (Fe3O4) or Hematite (Fe2O3)
Ruby
Corundum (Al2O3 with Chromium trace impurities)
Chert (often called Flint)
Chert (SiO2)
Slag Glass (Cullet)
Amorphous Silica / Glass residue
Cubic Zirconia (Faceted)
Zirconium Dioxide (ZrO2)
Chalk
Calcium Carbonate (CaCO3)
Goldstone and Aura Quartz
Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
Slag (Industrial Byproduct)
Ferro-silicate glass (Slag)
Chert (variations include Flint/Novaculite)
Chert (formula: SiO2)
Rough White Zircon
Zircon (Zirconium Silicate, ZrSiO4)
Ruby
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
Diamond (in jewelry)
Cubic Carbon (C)
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Chert (Flint / Jasper variant)
Microcrystalline Quartz (SiO2)
Orange Sapphire
Corundum (Al2O3)
Chert
Microcrystalline quartz (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Chert (Flint)
Microcrystalline Silica (SiO2)
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
Diamond
Carbon (C), Native Element
Chert (Flint)
Chert (SiO2)
Ruby (faceted gemstone)
Corundum (Al2O3 with Cr impurities)
Blue Sapphire
Corundum (Al2O3)
Smoky Quartz
Silicon Dioxide (SiO2)
Natural or Cultured Pearl
Calcium Carbonate (Aragonite and Conchiolin), CaCO3
Obsidian
Volcanic Glass (Amorphous SiO2)
Chert (Black Flint)
Silicon Dioxide (SiO2)
Iron-stained quartz-rich rock, possibly jasper or chert
Microcrystalline quartz (SiO₂) with iron oxides/hydroxides
Brown Chert
Microcrystalline Quartz (SiO2)