Ruby
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
Category
Browse synthetic (man made glass) specimens identified by the Rock Identifier community.
Ruby
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
Diamond (in jewelry)
Cubic Carbon (C)
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
Chalk
Calcium Carbonate (CaCO3)
Slag Glass (Cullet)
Amorphous Silica / Glass residue
Slag (Industrial Byproduct)
Ferro-silicate glass (Slag)
Ruby (faceted gemstone)
Corundum (Al2O3 with Cr impurities)
Blue Sapphire
Corundum (Al2O3)
Smoky Quartz
Silicon Dioxide (SiO2)
Goldstone and Aura Quartz
Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)
Chert (variations include Flint/Novaculite)
Chert (formula: SiO2)
Chert (Flint)
Microcrystalline Silica (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Chert (Flint / Jasper variant)
Microcrystalline Quartz (SiO2)
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Chert
Microcrystalline quartz (SiO2)
Chert (Flint)
Chert (SiO2)
Natural or Cultured Pearl
Calcium Carbonate (Aragonite and Conchiolin), CaCO3
Iron-stained quartz-rich rock, possibly jasper or chert
Microcrystalline quartz (SiO₂) with iron oxides/hydroxides
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
Borosilicate Glass (Manufactured)
SiO2 + B2O3 (Silicon dioxide and Boron trioxide)
Diamond
Carbon (C), Native Element
Obsidian
Volcanic Glass (Amorphous SiO2)
Chert (Black Flint)
Silicon Dioxide (SiO2)
Chert (Flint)
Silicon Dioxide (SiO2)
Brown Chert
Microcrystalline Quartz (SiO2)
Strawberry Quartz (or Pink Aventurine)
Quartz with Hematite/Goethite inclusions (SiO2)
Diamond
Carbon (C)
Aura Quartz / Rainbow Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
Diamond
Carbon (C)
Diamond (in a jewelry setting)
Carbon (C)
Crystal Quartz Beads (likely Clear Quartz)
Quartz (SiO₂)
Chert (Common Opal/Jasper variety)
Cryptocrystalline Quartz (SiO2)
Chert / Flint
Microcrystalline Quartz (SiO2)
Aquamarine in Onyx / Blue Topaz Pendant
Beryl (Be₃Al₂Si₆O₁₈) or Topaz (Al₂SiO₄(F,OH)₂)
Diamond (Baguette cut)
Carbon (C)
Ruby (Corundum)
Aluminum oxide (Al2O3) with Chromium traces
Diamond
Diamond (C)
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
Blue Agate Geode (Dyed)
Cryptocrystalline Quartz (SiO2)
Chert (Flint Nodules)
Cryptocrystalline Quartz (SiO2)
Chert
Microcrystalline quartz (SiO2)