Quartz
Silicon Dioxide (SiO2)
mineral
Category
Igneous, Sedimentary, Metamorphic, Mineral, Gemstone, Fossil, Or Meteorite
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Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite in Quartzite/Graphite Matrix
Iron Sulfide (FeS2)
Mineral
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz (Clear/Crystalline)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Limestone Concretion (Botryoidal/Calcareous Nodules)
Calcium Carbonate Concretion (CaCO3)
sedimentary
Clear Quartz (Rock Crystal)
Crystalline Silicon Dioxide (SiO2)
gemstone
Quartz (Milky/Crystalline variety)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion
Ironstone (Limonite/Goethite Concretion)
sedimentary
Citrine
Silicon dioxide (SiO2)
gemstone
Pyrite
Iron Disulfide (FeS2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Garnet Gneiss
Garnetiferous quartzo-feldspathic gneiss
metamorphic
Fossil-bearing limestone (probable)
Limestone, chiefly calcite (CaCO₃), with a visible spiral fossil that may be a gastropod
fossil
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Yellow/Orange variety)
Silicon Dioxide (SiO2)
mineral
Indochinite Tektite
Tektite (high-silica impact glass)
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Polished amber
Amber (fossilized plant resin; chiefly amorphous organic compounds)
gemstone
Magnetite
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Quartz (specifically Clear or Rose Quartz)
Silicon Dioxide (SiO2)
mineral
Weathered metallic-looking rock, possibly hematite-bearing ironstone
Hematite-rich ironstone; hematite Fe₂O₃, potentially with magnetite Fe₃O₄ and quartz
mineral
Quartz
Silicon dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Tumbled amber
Fossilized tree resin (amber; composition varies, commonly C₁₀H₁₆O)
gemstone
Fossil shark tooth
Likely fossilized shark tooth, possibly Carcharhinus or Otodus species
fossil
Garnet
Silicate mineral group (e.g., Almandine, Fe3Al2(SiO4)3)
mineral
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Sandstone with Limonite/Goethite coating (Fe2O3·H2O)
sedimentary
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Clear Quartz (Faceted)
Silicon Dioxide (SiO2)
gemstone
Olivine
Olivine group (Mg, Fe)2SiO4
mineral
Quartz
Silicon Dioxide (SiO2)
mineral