Metal Chain (Likely Steel or a Steel Alloy)
Steel (primarily iron and carbon); specific alloy unknown
Man-made Object (Metal/Alloy)
Category
Anthropogenic (Man Made Artifact)
Browse anthropogenic (man made artifact) specimens identified by the Rock Identifier community.
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Chert (Arrowheads)
Microcrystalline Quartz (SiO2)
sedimentary
ABS Plastic (Acrylonitrile Butadiene Styrene)
(C8H8)x·(C4H6)y·(C3H3N)z
Synthetic Polymer (Synthetic Material)
Blue slag glass / industrial smelter slag
Man-made iron-rich silicate slag; composition variable, commonly Fe–Ca–Mg–Al silicates with glassy phases
mineral
Chert Arrowhead (Lithic Artifact)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Iron Slag
Iron/Steel Slag (Ferrosilicate Glass)
industrial byproduct (anthropogenic material)
Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Opalite
Synthetic glass (SiO2 + impurities)
mineral
Chert Arrowhead (Jasper)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Diamond
Native Carbon (C)
gemstone
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Synthetic Costume Accessory (Non-Geological)
Polyester and Acrylic Fiber (Anthropogenic polymer)
Synthetic / Man-made textile
Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)
Silicon Dioxide (SiO2) with inclusions/dye
gemstone
Chalcedony (likely blue agate) knapped into an arrowhead
Microcrystalline quartz, SiO₂ (chalcedony)
mineral
Not a rock, mineral, or geological specimen
N/A
Opalite
Synthetic glass / Opaque silicious glass
gemstone
Chert Arrowhead
Cryptocrystalline microcrystalline Quartz (SiO2)
sedimentary
Opalite
Man-made opalescent glass
gemstone
Opalite
Man-made opalized glass
mineral
Goldstone
Aventurine Glass (Man-made)
mineral
Sea Glass
Man-made silicate glass
gemstone
Slag Glass
Amorphous Silicate (Man-made)
industrial byproduct
Ring with an Orange Inlay
N/A (Man-made object)
Man-made Object (Ring)
Chert (Arrowhead)
Chert (SiO2)
sedimentary
Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
sedimentary (anthropogenic/man-made conglomerate)
Sea Glass
Man-made vitreous material
mineral
Slag (Anthropogenic Glass/Iron byproduct)
Ferro-silicate Slag
Anthropogenic (Man-made)
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Small pebble, likely limestone
Unidentified carbonate pebble, possibly micritic limestone (calcite, CaCO₃)
sedimentary
Chert (Arrowhead)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead/Projectile Point)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert Arrowhead (Lithic Artifact)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint or River Stone)
Microcrystalline alpha-quartz (SiO2)
sedimentary
Diamond (or Simulant)
Carbon (C)
gemstone
Likely chert (flint)
Microcrystalline quartz (SiO₂), likely chert; exact identification is uncertain from the image alone
sedimentary
Chert (Arrowhead artifact)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Sea Glass
Silicon dioxide (mostly)
mineral
Blue crystal pendant (likely blue glass or synthetic crystal)
Not identifiable from the image; possibly synthetic quartz or glass, rather than a natural mineral
gemstone
Obsidian
Obsidian (Volcanic Glass)
igneous