Rainbow Hematite (Man-made/Treated)
Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)
mineral
Category
Anthropogenic (Man Made Artifact)
Browse anthropogenic (man made artifact) specimens identified by the Rock Identifier community.
Learn about Anthropogenic (Man Made Artifact) in the encyclopedia
View all →
Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Amorphous Solid
Man-made Blank Ammunition (Brass)
CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)
Anticrystalline / Synthetic Alloy
Man-made Glass (Tumbled/Shaped)
Amorphous Silicon Dioxide (SiO2) with metal oxide colorants
Mineraloid (synthetic)
Man-made Crystal (Lead Glass)
Lead oxide-doped Silica Glass (approx. SiO2 + PbO)
Mineraloid/Synthetic Material
Man-made Dyed Aura Quartz
Silicon Dioxide (SiO2) with metallic coating/dye
mineral
Asphalt Chunk
Asphalt concrete
man-made composite
Tumbled black obsidian (likely)
Volcanic glass; chiefly silica-rich rhyolitic glass (SiO₂)
igneous
Blue sea glass or blue glassy mineral fragment
Uncertain; likely man-made soda-lime glass, not a natural mineral
mineral
Blue glassy fragment among beach gravel
Likely cobalt-blue man-made glass; not a natural mineral specimen
mineral
Opalite
Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)
mineraloid
Slag Glass (Cullet)
Amorphous Silica (man-made), primarily SiO2 with trace metal oxides
Mineraloid / Synthetic Glass
Chert (Cherty Shale / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Purple glassy pebble, possibly slag glass
Unidentified; likely man-made glass rather than a natural mineral
mineral
Goldstone (brown goldstone)
Man-made aventurine glass, typically copper-bearing silica glass
gemstone
Green sea glass (likely slag glass or bottle glass)
Man-made soda-lime silicate glass; not a naturally occurring mineral
mineral
Libyan Desert Glass
Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)
mineral (Tektite/Impactite)
Chert (Commonly known as Flint)
Silicon Dioxide (SiO2)
sedimentary
Sea Glass (Frosted Glass Fragment)
Amorphous Silica (Anthropogenic Sediment)
sedimentary
Slag
Anthropogenic Iron Silicate Glass
mineral
Leland Blue Stone
Anthropogenic Iron Smelting Slag
mineraloid
Slag (Industrial Byproduct)
Anthropogenic Vitreous Silicate material
igneous
Chert (often called Flint)
Chert (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
metamorphic (man-made/anthropogenic)
Sea Glass (Cobalt Blue)
Amorphous Silica (Glass with Cobalt additives)
Anthropogenic specimen (man-made)
Dyed Crackle Quartz
Silicon Dioxide (SiO2) with synthetic dye
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Possible weathered basalt or slag fragment
Basalt, chiefly plagioclase and pyroxene; identification is uncertain from the image
igneous
Chert / Flint (Artifact)
Microcrystalline quartz (SiO2)
sedimentary
Goldstone (aventurine glass)
Man-made copper-bearing glass; not a natural mineral (commonly sold as blue/brown goldstone)
mineral
Chert (Arrowhead Point)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
fossil
Chert (Black Chert or Flint)
Silicon Dioxide (SiO2)
sedimentary
Anthropogenic Heat Source (Electronic/Industrial Interface)
Thermal IR emission (Electronic infrastructure)
not a rock or mineral
Dyed Dragon Vein Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Chert Arrowhead and Quartz Specimen
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint (Arrowhead Artifact)
Microcrystalline quartz (SiO2)
sedimentary
Slag (Industrial Glass)
Anthropogenic Amorphous Vitreous Silicate
mineraloid
Slag (Industrial Glassy Byproduct)
Anthropogenic silicate byproduct (Slag)
Mineral-like byproduct (often mistaken for igneous rock or meteorite)
Green Slag Glass
Amorphous Silica Glass (Anthropogenic)
Industrial byproduct (often mistaken for obsidian or mineral)