Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Category
Anthropogenic Specimen (Man Made Material)
Browse anthropogenic specimen (man made material) specimens identified by the Rock Identifier community.
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Fossilized oyster shell
Bivalvia; likely an oyster (Ostreidae), partly mineralized with calcite
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Blue Chalcedony Cube
Silicon Dioxide (SiO2)
mineral
White quartz bead bracelet (likely milky quartz)
Quartz, silicon dioxide (SiO₂), usually microcrystalline or cloudy crystalline quartz
mineral
Chert (variations include Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Slate
Metamorphic Pelitic Rock
metamorphic
Chert or Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Iron-stained)
Chert (Microcrystalline and Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Arrowhead variety)
Chert (SiO2)
sedimentary
Slag (Industrial Glassy Byproduct)
Ferro-silicate Slag
Anthropogenic / Non-Natural
Stone bead bracelet
Unidentified polished natural-stone beads; possibly wood-grain jasper, agate, or serpentine
mineral
Ruby in Matrix
Corundum (Al2O3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (varietal: Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Iron Slag
Anthropogenic Vitreous Ferrous Silicate
industrial byproduct (anthropogenic)
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Green Slag Glass
Amorphous Silica Glass (Anthropogenic)
Industrial byproduct (often mistaken for obsidian or mineral)
Red-orange sunstone (likely aventurine feldspar) bead bracelet
Feldspar, commonly oligoclase or labradorite with copper inclusions; composition varies by source
mineral
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Coquina
Bioclastic Limestone
sedimentary
Blue chalcedony cabochon (probable)
Chalcedony, a cryptocrystalline variety of quartz; silicon dioxide, SiO₂
gemstone
Engraved purple stone cabochon, possibly amethyst
Unconfirmed; if amethyst, quartz (SiO₂)
gemstone
Polished stromatolite (likely fossilized microbial mat)
Fossil stromatolite; chiefly microcrystalline quartz (SiO₂), commonly replacing carbonate
fossil
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Man-made Glass (Not a natural rock or mineral)
Diamond
Carbon (C)
gemstone
Greenstone Celt (Polished Stone Axe)
Metamorphosed mafic rock (often Basalt or Diabase)
metamorphic
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Cobalt Blue Sea Glass
Amorphous Silica Glass (SiO2 + CoO)
mineraloid / anthropogenic material
Red Slag Glass (Cullet)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Antropogenic (Man-made material)
Diamond (Cut and Polished)
Diamond (pure Carbon, C)
gemstone
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Tumbled fossil shark tooth pendant
Likely fossilized shark tooth, possibly Otodus or Carcharhinus; exact species cannot be confirmed from the image
fossil
Land Snail Shell
Gastropoda (Calcium Carbonate, CaCO3)
fossil
Greenstone
Metabasalt / Metavolcanic rock
metamorphic
Conglomerate (Asphaltic/Anthropogenic)
Clastic sedimentary rock / Bituminous mixture
sedimentary
Slate
Metamorphic Pelitic Rock
metamorphic
Slate
Metamorphic Pelitic Rock
metamorphic
Iron-rich vesicular rock, possibly slag or weathered basalt
Identification uncertain; likely ferruginous basalt/ironstone, with possible anthropogenic iron slag
igneous
Gemstone ring (stones not reliably identifiable from the image)
Likely faceted yellow stones and clear stones set in a metal band; species and treatments are indeterminate visually
gemstone
Possible basalt or iron-rich slag
Basalt (tentative; identification uncertain from image)
igneous
Tumbled chert or jasper pebble
Microcrystalline quartz (SiO₂), likely chert/jasper
sedimentary