Chert (Arrowhead/Tool variety)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock)
Browse industrial byproduct (anthropogenic rock) specimens identified by the Rock Identifier community.
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Green Sea Glass
Man-made vitreous material (silica glass)
gemstone
Mystic Topaz
Aluminum silicate fluoride hydroxide with titanium coating (Al2SiO4(F,OH)2)
mineral
Crackled Quartz (Blue Dyed)
Silicon Dioxide (SiO2) with anthropogenic dye
mineral
Green Quartz (Prasiolite or Aventurine)
Silicon Dioxide (SiO2)
mineral
N/A (Non-Geological Object)
N/A
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Bismuth
Bismuth (element Bi) with oxidized thin-film interference layer
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Fired Clay Brick (Anthropic Rock substitute)
Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)
metamorphic (man-made / anthropic)
Chert Arrowhead (Projectile Point)
Microcrystalline Quartz (Chert or Flint)
sedimentary
Chert (Arrowhead/Projectile Point)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Arrowhead/Projectile Point)
Cryptocrystalline Quartz (SiO2)
sedimentary
Sea Glass
Amorphous Silica (Anthropogenic glass) - SiO2
mineral
Silver Nuggets (Natural or Cast)
Native Silver (Ag)
mineral
Quartzite (Lithic Artifact)
Quartzite (SiO2)
metamorphic
Titanium Aura Quartz (Bismuth-coated Druzy)
Silicon Dioxide (SiO2) with Titanium/Metal vapor coating
mineral
Milky Quartz or Calcite Pebble
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
mineral
Chert (Arrowhead Debitage or Flake)
Microcrystalline silica (SiO2)
sedimentary
Tiffany Stone
Fluoritized Opal Beryllium Tuff (composed of Fluorite; CaF2, Opalized SiO2, Bertrandite, Chalcedony, and Quartz)
metamorphic
Likely iron-rich slag or weathered ironstone
Hematite–goethite-rich material (Fe₂O₃/FeO(OH)); possibly industrial iron slag
mineral
Sulfur
Native Sulfur (S)
mineral
Sulfur (with Matrix)
Native Sulfur (S8)
mineral
Bismuth Crystal
Bismuth (Bi)
mineral
Fluorite (Fluor-spar)
Calcium Fluoride (CaF2)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Gravel or Crushed Stone
Fragmented Aggregate Stone
sedimentary or igneous fragment
Arsenopyrite with Schist Matrix
Arsenopyrite (FeAsS)
mineral
Fluorite (Purple/Blue variety)
Calcium Fluoride (CaF2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chalcopyrite
Chalcopyrite (CuFeS2)
mineral
Silver (Sterling Silver Jewelry)
Argentum (Ag) mixed with Copper (Cu)
mineral
Silver (Jewelry form)
Native Silver (Ag)
mineral
South Korean 100 Won Coin (Cupronickel)
Cupronickel Alloy (75% Cu, 25% Ni)
mineral-based alloy (anthropogenic)
Coal
Carbonaceous sedimentary rock / Lignite to Bituminous coal
sedimentary
Asphalt (Road Aggregate)
Asphalt concrete / Bituminous mixture
anthropogenic sedimentary (technolith)
Red Sandstone
Clastic Sandstone (typically Quartz-rich with Iron Oxide)
sedimentary
Mother of Pearl (Nacre)
Aragonite (CaCO3) with Organic Matrix
mineral
Vesicular Basalt (Lava Rock)
Vesicular Basalt
igneous
Chert Arrowhead
Cryptocrystalline microcrystalline Quartz (SiO2)
sedimentary
Quartzite Arrowhead (Archaeological Lithic)
Recrystallized Quartz (SiO2)
metamorphic
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral