Chert (Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Category
Antropogenic (Man Made Industrial Byproduct)
Browse antropogenic (man made industrial byproduct) specimens identified by the Rock Identifier community.
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Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
gemstone
Coal (Anthracite / Bituminous)
Organic Sedimentary Rock (Carbon-based)
sedimentary
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Diamond (Faceted)
Carbon (C)
gemstone
Chert (specifically Zebra Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Black stone bead bracelet
Likely black tourmaline (schorl), though identification is uncertain from the image
mineral
Asphalt Pavement (with aggregate)
Asphalt concrete
man-made composite
Cardstock (Paper)
Cellulose (C6H10O5)n
sedimentary (man-made)
Blue Goldstone
Aventurine Glass (SiO2 with Cobalt/Copper inclusions)
man-made glass
Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)
Silicon Dioxide (SiO2) with metallic inclusions
man-made material
Blue chalcedony cabochon (probable)
Chalcedony, a cryptocrystalline variety of quartz; silicon dioxide, SiO₂
gemstone
Yellow faceted gemstone, likely citrine or synthetic glass
Citrine (quartz, SiO₂) is the leading natural possibility; visual identification is uncertain from the photograph
gemstone
Possible basalt or industrial iron-rich slag
Basalt (plagioclase–pyroxene rock); identification uncertain from image
igneous
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Sea Glass
Amorphous Silicon Dioxide (SiO2)
Mineral/Man-made
Crackle Glass (Simulated Gemstone)
Amorphous Solid (SiO2)
man-made glass
Blue Goldstone
Synthetic glass with copper or cobalt/manganese inclusions
man-made glass
Blue Goldstone
Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)
man-made glass
Blue Goldstone
Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)
man-made glass
Porcelain (Stoneware Ceramic)
Mullite / Silica-glass composite (Al6Si2O13)
metamorphic (man-made)
Goldstone (Brown)
Aventurine glass
mineraloid (man-made)
Lapis lazuli bead bracelet
Lapis lazuli, chiefly lazurite (Na₃Ca(Si₃Al₃)O₁₂S); commonly with calcite and pyrite
metamorphic
Carved smoky quartz (likely)
Quartz, silicon dioxide (SiO₂), smoky variety
mineral
Desert Rose (Baryte or Gypsum Rose)
Baryte (BaSO4) or Gypsum (CaSO4·2H2O)
mineral
Chert (specifically Gray/Blue-Gray Chert)
Chert (SiO2)
sedimentary
Dyed Quartz (often sold as 'Blue Quartz' or 'Blue Agate')
Silicon Dioxide (SiO2) with artificial pigment
mineral
Glazed Ceramic Tile
Fused Silicate-Clay composite
Synthetic (Man-made material mimicking natural stone)
Hoodoo (Limestone / Siltstone Formation)
Claron Formation (Sedimentary Rock - Limestone, Mudstone, Dolomite)
sedimentary
Chert (Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Black tourmaline bead bracelet (likely schorl)
Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
mineral
Diamond (as set in a metal alloy ring)
Diamond (Pure Carbon, C)
mineral
Diamond
Carbon (C)
mineral
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Chalcanthite (Likely Synthetic/Lab-Grown)
Hydrated copper(II) sulfate (CuSO4·5H2O)
mineral
Diamond
Carbon (C)
gemstone
Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral (man-enhanced)
Amethyst gemstone ring
Quartz, purple variety — SiO₂
gemstone
Green Banded Chert (Agate/Jasper)
Silicon Dioxide (SiO2) with trace impurities of Chlorite or Glauconite
sedimentary
Rough Diamond
Diamond (Pure Carbon: C)
mineral