Chert (Jasper/Common Chert Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Man Made Material
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Asphalt (Bituminous Concrete)
Composite material (bitumen binder with mineral aggregate)
man-made rock (technosol)
Polished/tumbled brown-and-white mineral fragment
Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral
mineral
Granodiorite / Granite (Weathered)
Granodiorite
Igneous
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Flint or chert fragment
Microcrystalline quartz (SiO₂), likely flint/chert
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Yellow/Tan variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert Nodule (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Diamond
Diamond (Pure Carbon, C)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Coquina
Bioclastic Limestone
sedimentary
Green cabochon gemstone, likely aventurine or dyed chalcedony
Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony
gemstone
Coquina (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Asphalt Concrete
Bituminous Concrete / Asphaltic Composite
not a natural rock (man-made composite)
Diamond
Diamond (pure Carbon, C)
mineral
Synthetic Marbled Aggregate (Footwear Component)
Ethylene-vinyl acetate (Croslite™)
not a rock (man-made polymer)
Coquina
Bioclastic Limestone (Coquina)
sedimentary
Sandstone
Arenite
sedimentary
Blue glassy cabochon, likely blue quartz or synthetic glass
Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive
gemstone
Tumbled amethyst quartz
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
gemstone
Polished blue stone, likely sodalite or dyed agate
Sodalite: Na₈(Al₆Si₆O₂₄)Cl₂; exact identification requires testing
mineral
Green cabochon gemstone, likely nephrite jade
Nephrite jade—interlocking amphibole fibers, chiefly tremolite-actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂
gemstone
Tumbled brown chalcedony or jasper
Microcrystalline quartz, SiO₂; possibly iron-bearing jasper
mineral
Chert (Flint / Jasper)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Diamond (in Jewelry)
Carbon (C)
mineral
Porcelain (Kaolin-based)
Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)
metamorphic (man-made/engineered)
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
Chert (Black Chert or Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint / Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Greenstone
Metamorphic mafic rock (chlorite-actinolite-epidote schist)
metamorphic
Flint / Chert
Microcrystalline quartz (SiO2)
sedimentary
Tektite (Indochinite)
Tektite (Amorphous Silica Glass)
igneous
Polished rutilated quartz cabochon
Quartz (SiO₂) with rutile inclusions (TiO₂)
gemstone
Likely clear quartz crystal (possibly cut/polished quartz or glass imitation)
Quartz, silicon dioxide (SiO₂)
mineral
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Chert (Black Flint)
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone
Arenite (Iron-rich)
sedimentary
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic