Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
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Red Jasper
Silicon Dioxide with iron impurities (Quartz variety, SiO2)
sedimentary
Sandstone with Trace Fossils
Quartz Arenite with Bioturbation (Trace Fossils)
sedimentary
Carnelian
Chalcedony (Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Fossilized Coral
Cnidaria fossil / Calcite-replaced coral
fossil
Tumbled Hematite
Hematite (Fe2O3)
mineral
Montana Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Tiger's Eye
Quartz pseudomorph after crocidolite (SiO2)
gemstone
Sandstone
Clastic sedimentary rock
sedimentary
Fossil Brachiopod or Mollusk Cast
Phylum Brachiopoda / Mollusca internal mold
fossil
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Limonite Bog Iron
Hydrated iron oxide-hydroxide, FeO(OH)·nH2O
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Fossil Shark Tooth
Selachii fossil
fossil
Shark Tooth Fossil
Carcharocles megalodon or similar extinct shark tooth
fossil
Sand Tiger Shark Tooth
Carcharias taurus
fossil
Shark Tooth Fossil
Otodus obliquus (or similar prehistoric lamniform shark tooth)
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Brecciated Jasper
Silicon Dioxide (SiO2) with hematite and other mineral impurities
sedimentary
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Red Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Plutonic Igneous Rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Zebra Jasper
Silicon dioxide (microcrystalline quartz), SiO2
sedimentary
Jasper and Mixed River Pebbles
Microcrystalline Quartz (Chalcedony / Jasper)
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Blue Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Hematite
Hematite (Fe2O3)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled Quartz
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Banded Sandstone / Quartzite with Mineral Veins
Sedimentary rock (Quartz arenite with iron oxide/silica banding)
sedimentary
Poppy Jasper
Microcrystalline Quartz (SiO2) with hematite and other inclusions
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary
River Pebble
Polished Quartzite / Siliceous River Pebble
sedimentary
Sandstone with Liesegang Rings
Quartzose Sandstone with Iron Oxide Precipitation
sedimentary