Star sapphire ring
Corundum (Al₂O₃), likely asteriated sapphire
gemstone
Category
Industrial By Product
Browse industrial by product specimens identified by the Rock Identifier community.
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Quartzite
Quartzite
metamorphic
Quartz pebble
Silicon dioxide (SiO2)
mineral
Synthetic Resin / Plastic Figurine
Synthetic Polymer (Copolymer of Polyethylene or Resin)
Mineraloid-like Synthetic Material
Synthetic Sapphire and Ion-X Glass
Single-crystal Alumina (Al2O3) and Ion-strengthened Aluminosilicate Glass
mineral
Quartz (Gravel Fragment)
Silicon Dioxide (SiO2)
mineral
Cullet Glass (Slag)
Amorphous Silicon Dioxide (Man-made)
Mineraloid
Quartzite (Milky)
Quartzite (SiO2)
metamorphic
Yellow Sapphire
Corundum (Al2O3:Fe)
gemstone
Opaline Glass (Opalite)
Synthetic Silicon Dioxide Glass
Mineraloid (Man-made)
Clear quartz crystal
Quartz (silicon dioxide, SiO₂)
mineral
Smoky quartz (likely)
Quartz, silicon dioxide (SiO₂)
mineral
Red Quartz (Druzy)
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Diamond
C (Native Carbon)
mineral
Sandstone with Iron Concretion
Arenite with Limonite/Goethite Concretion
sedimentary
Limonite (Iron Ore)
Hydrated ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Quartz cluster (likely milky quartz)
Quartz, silicon dioxide (SiO₂), trigonal crystal system
mineral
Opalite-style glass pendant
Man-made opalescent glass (not natural opal)
mineral
Ruby (mounted cabochon)
Corundum, Al₂O₃; red color typically from chromium
gemstone
Diamond (or Diamond Simulant)
Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)
gemstone
Coal
Carbonaceous sedimentary rock / Lignite to Bituminous coal
sedimentary
Coal
Biogenic sedimentary rock (Carbon)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Diamond (Faceted Gemstone)
Native Carbon (C)
mineral
N/A - Image is non-geological
Acrylonitrile Butadiene Styrene (ABS) or Polypropylene (PP)
Synthetic material (Plastic/Polymer)
Synthetic Costume Accessory (Non-Geological)
Polyester and Acrylic Fiber (Anthropogenic polymer)
Synthetic / Man-made textile
Rough Diamond
Diamond (C)
mineral
Cut red gemstone, likely ruby
Ruby, gem-quality corundum (Al₂O₃) colored by chromium
gemstone
Synthetic Convention Badge (Plastic/PVC)
Polyvinyl Chloride (PVC) / Polycarbonate
mineraloid (synthetic)
Cupronickel Coin
Copper-Nickel Alloy (typically 75% Cu, 25% Ni)
anthropic metallic specimen
Bicolor Quartz (Milk Quartz with Slag or Dark Inclusions)
Silicon Dioxide (SiO2) with impurities
mineral
Gastly (Trick or Trade Halloween Series)
Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)
Mineral (Synthetic - Paper and Ink Polymorph)
Obsidian
Volcanic Glass (SiO2)
igneous
Diamond (likely facet or crystal shard)
Diamond (C)
mineral
Anthracite Coal
Anthracite
sedimentary
Note: Item is a Synthetic/Man-made Object
Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)
Non-geological
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (Industrial byproduct)
mineraloid
Ferrochrome Slag
Anthropogenic silicate/oxide glass (Complex silicate matrix with Cr-Fe-Si inclusions)
Industrial byproduct (often confused with igneous rocks or meteorites)
Basalt or Slag
Extrusive Igneous Rock / Industrial Slag
igneous
Slag
Ferrous Slag (Siliceous industrial waste)
Anthropogenic (Man-made industrial byproduct)
Green Slag Glass (Cullet)
Amorphous Silica (Industrial Glass Byproduct)
Synthetic/Byproduct (Non-igneous, non-sedimentary, non-metamorphic)