Iron Slag
Iron smelting byproduct (Glassy/vesicular silicate)
anthropogenic / industrial byproduct
Category
Anthropogenic Specimen (Man Made)
Browse anthropogenic specimen (man made) specimens identified by the Rock Identifier community.
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Yellow Chert (Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Weathered iron-rich rock, possibly jasper or ironstone
Likely limonite/goethite-bearing siliceous rock; exact identification requires hardness and streak tests
mineral
Fossilized coral with attached shell
Likely fossil coral (Scleractinia or Tabulata), with a bivalve or gastropod shell; exact identification requires microscopy
fossil
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Carved quartz (likely rose quartz and green aventurine/quartz)
Quartz, silicon dioxide (SiO₂); green material may be aventurine quartz or serpentine
gemstone
Stone bead bracelet
Unidentified polished natural-stone beads; possibly wood-grain jasper, agate, or serpentine
mineral
Tiger Shark Fossil Tooth
Galeocerdo cuvier (fossilized)
sedimentary
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
mineral
Diamond (Colorless/White)
Carbon (C)
mineral
Fossilized oyster shell
Bivalvia; likely an oyster (Ostreidae), partly mineralized with calcite
fossil
Sandstone
Arenite (SiO2 principal)
sedimentary
Slag (Industrial Glassy Byproduct)
Ferro-silicate Slag
Anthropogenic / Non-Natural
Gabbro
Gabbro
igneous
Vesicular basalt (likely scoria)
Basaltic scoria; predominantly plagioclase, pyroxene, and olivine in a mafic volcanic glass/microcrystalline matrix
igneous
Chert (often called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Bismuth crystal
Bismuth (Bi), synthetic laboratory-grown crystal
mineral
Chalcedony with iron-oxide staining
Microcrystalline quartz (SiO₂), likely chalcedony or chert with limonite/goethite staining
mineral
Chert (Field-collected Arrowhead-shaped Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Carved smoky quartz (likely)
Quartz, silicon dioxide (SiO₂), smoky variety
mineral
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
sedimentary
Flint (chert)
Microcrystalline quartz (SiO₂), commonly called chert or flint
sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
mineral
Clear-stone silver-tone teardrop earring
The stones may be colorless quartz or glass; the image does not allow reliable identification. Metal setting appears silver-tone.
gemstone
Goldstone (Red)
Aventurine Glass
Man-made material (Simulated Mineral)
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Fossil Shark Tooth
Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna
fossil
Blue-dyed Quartz Druzy
Silicon Dioxide (SiO2) with artificial pigment
mineral
Native American Pottery Sherd
artifact
Chert (Nodule)
Chert (SiO2)
sedimentary
Yellow chalcedony (likely agate) cabochons
Microcrystalline quartz, SiO₂; chalcedony variety, possibly naturally colored or dyed
gemstone
Granite
Phaneritic Plutonic Felsic Rock
igneous
Chert (likely flint)
Microcrystalline quartz, SiO₂
sedimentary
Blue opalite (often sold as synthetic opal)
Opalite glass; amorphous hydrated silica if natural opal (SiO₂·nH₂O)
gemstone
White quartz bead bracelet (likely milky quartz)
Quartz, silicon dioxide (SiO₂), usually microcrystalline or cloudy crystalline quartz
mineral
Chert (specifically Flint or Common Chert node)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary