Fossiliferous Limestone (Crinoid stem fossils)
Sedimentary Limestone with Crinoidea ossicles
fossil
Category
Anthropogenic (Man Made Industrial Deposit)
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Diamond
Carbon (C)
gemstone
Chert (Flint Nodules)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Native Copper
Copper (Cu)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
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
Sandstone
Sandstone (composed predominantly of Quartz, SiO2, with Feldspar and Clay minerals)
sedimentary
Dolerite (Diabase)
Dolerite / Diabase
igneous
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Chert Pebble/Nodule
Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)
Sedimentary
Glazed Ceramic Tile
Fused Silicate-Clay composite
Synthetic (Man-made material mimicking natural stone)
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Sandstone Pebble
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
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
Chert (Green Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth (Eroded)
Carcharodon sp. or Otodus sp. fragment (likely)
fossil
Amethyst (Tumbled/Weathered Quartz)
Amethyst (SiO2 with iron impurities)
mineral
South Korean 100 Won Coin (Cupronickel)
Cupronickel Alloy (75% Cu, 25% Ni)
mineral-based alloy (anthropogenic)
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Chert (Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Weathered chert or chalcedony nodule
Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony
sedimentary
Sandstone
Arenite
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Chert (Commonly known as Flint)
Silicon Dioxide (SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Peridotite (Olivine/Peridot)
Peridotite (comprising (Mg,Fe)2SiO4)
igneous
Clay (as a rock-forming material)
Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)
Mineral
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Flint/Chert Nodule in Limestone
Sedimentary rock containing microcrystalline quartz (SiO2) within a calcium carbonate (CaCO3) matrix
sedimentary
Petoskey Stone / Rugose Coral Fossil
Hexagonaria percarinata
fossil
Native Silver
Silver (Ag)
mineral
Chert (Flint / Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite (Bog Iron)
Limonite (Hydrated iron(III) oxide-hydroxide) - FeO(OH)·nH2O
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Polished greenstone pebble
Likely nephrite jade (tremolite–actinolite), though serpentine or greenstone is possible from appearance alone
metamorphic