Chert Arrowhead (Lithic Tool)
Microcrystalline quartz (SiO2) - Archeological lithic artifact
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock)
Browse industrial byproduct (anthropogenic rock) specimens identified by the Rock Identifier community.
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Slag
industrial by-product
Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)
Amorphous Silicon Dioxide (SiO2) with chemical additives (e.g., Cobalt for blue color)
mineraloid / industrial byproduct
Jasper (Multi-colored) / Sea Glass Slag
Silicon Dioxide (SiO2) with impurities of Iron Oxide
Sedimentary (if natural Jasper) or Artificial (if Slag)
Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
sedimentary (anthropogenic/man-made)
Red Slag Glass (Cullet)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Antropogenic (Man-made material)
Asphalt (Bituminous pavement)
Bituminous concrete / Asphalt
Sedimentary (Anthropogenic)
Obsidian Arrowhead
Obsidian (Volcanic Glass)
igneous
Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)
Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)
sedimentary
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Asphalt (Road Aggregate)
Bituminous Conglomerate / Asphalt Concrete
Anthropogenic (Man-made)
Slag Glass
Glassy Silicate Residue
industrial byproduct
Tiffany Stone
Bertrandite Fluorite (CaF2 + Be4Si2O7(OH)2)
metamorphic
Conglomerate (Asphaltic/Anthropogenic)
Clastic sedimentary rock / Bituminous mixture
sedimentary
Sandstone (likely Fossilized Wood or Concrete Simulacrum)
Arenite / Silicified Wood / Anthropogenic Concrete
sedimentary
Quartz (Milky/River Quartz)
Silicon Dioxide (SiO2)
mineral
Sea Glass
Man-made vitreous material (silica-based glass)
mineral
Slag Glass
SiO2 (Silicon Dioxide) with impurities
man-made glass
Sandstone-based Concrete Fragment
Cementitious Composite with Sedimentary Aggregate
sedimentary (man-made/anthropogenic)
Blue Sea Glass
Amorphous Silica (Anthropogenic glass)
not a rock (man-made origin)
Chert (Arrowhead variety)
Chert (SiO2)
sedimentary
Greenstone Celt (Polished Stone Axe)
Metamorphosed mafic rock (often Basalt or Diabase)
metamorphic
Concrete
Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)
sedimentary (anthropogenic / man-made)
Chert / Flint Handaxe
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead Preform or Point)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Green Obsidian Sphere (man-made glass)
Vitreous Silica with Chromium/Iron additives
mineralogical simulant
Concrete Fragment
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Granite Pebble
Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)
igneous
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
mineral (synthetic)
Chert (Arrowhead Fragment)
Silicon Dioxide (SiO2)
sedimentary
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Tiffany Stone
Bertrandite-Bearing Fluorite Hyalite Opal
metamorphic
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Slag
Ferrous slag (by-product of iron smelting)
Mineraloid / Anthropogenic
Fluorite
Calcium fluoride (CaF2)
mineral
Bismuth
Bismuth (Bi)
mineral
Concrete
Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)
sedimentary (artificial)
Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)
Silicon Dioxide (SiO2) with metallic inclusions
man-made material
Chert Arrowhead (Projectile Point)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Arrowhead/Projectile Point)
Microcrystalline quartz (SiO2)
sedimentary
Sea Glass (Frosted Glass Fragment)
Amorphous Silica (Anthropogenic Sediment)
sedimentary