Fossil tooth, likely shark tooth
Fossilized selachian tooth; exact species cannot be determined from the image
fossil
Category
Industrial Byproduct
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Fossilized gastropod (snail)
Silicified or calcite-replaced gastropod fossil; exact genus indeterminate
fossil
Polished amber cabochons
Amber (fossilized plant resin), chiefly polymerized terpenoid resin
gemstone
Tiny rounded brown mineral grain
Indeterminate; possibly iron oxide, garnet, or a weathered sulfide grain
mineral
Polished pietersite cabochon
Pietersite (brecciated fibrous quartz/chalcedony, commonly with riebeckite or crocidolite remnants)
metamorphic
Polished orbicular jasper (likely ocean jasper)
Silica-rich microcrystalline quartz/chalcedony with iron-oxide and feldspar inclusions; commonly called ocean jasper
mineral
Rounded gray pebble
Indeterminate; likely fine-grained quartz-rich silicate rock
sedimentary
Small rounded pebble
Indeterminate; likely a weathered iron-rich silicate rock or concretion
mineral
Agate
SiO2 (Silicon Dioxide)
mineral
Quartz pebble with iron staining
Silicon dioxide (SiO2) with iron oxide impurities
mineral
Quartzite River Stone
Quartzite (SiO2)
metamorphic
Greenschist
Chlorite schist
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Soapstone (Steatite) and Quartz mix
Steatite (Mg3Si4O10(OH)2) and Quartz (SiO2)
metamorphic
Sandstone
Arenite (composed mainly of SiO2)
sedimentary
Sandstone (Iron-stained)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Quartz Pebble
Crystalline Silica (SiO2)
sedimentary
Sea Shell Fragment (Calcium Carbonate)
Aragonite / Calcite (CaCO3)
mineral
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Diamond or Cubic Zirconia
Carbon (diamond) or Zirconium dioxide (cubic zirconia)
gemstone
Corundum (Sapphire / Raw Sapphire)
Aluminum Oxide (Al2O3)
gemstone
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Quartz with Tourmaline
Silicon Dioxide with Schorl (SiO2 + NaFe3Al6(Si6O18)(BO3)3(OH)4)
mineral
Gold Nugget
Gold (Au)
mineral
Sandstone (Pebble)
Sandstone (SiO2 with iron oxide impurities)
sedimentary
Gold-bearing Quartz Ore
Auriferous Quartz (SiO2 + Au)
metamorphic
Quartz and Iron Oxide
Quartz (Silicon Dioxide, SiO2) with possible Limonite/Hematite inclusions
mineral
Rounded river pebble
Indeterminate lithic clast; likely weathered sandstone or quartz-rich sedimentary rock
sedimentary
Unidentified dark pebble
Undetermined; possibly polished basalt, chert, or iron-rich stone
mineral
Orange fire opal jewelry
Precious opal, hydrated amorphous silica (SiO₂·nH₂O)
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Peridotite (Olivine/Peridot)
Peridotite (comprising (Mg,Fe)2SiO4)
igneous
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Garnet (Almandine)
Almandine Fe3Al2(SiO4)3
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granitic Gravel
Granite (Quartz, Feldspar, and Mica mixture)
igneous
Garnet Schist
Almandine-mica schist
metamorphic