Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
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Petrified Wood
Silicified Wood (SiO2)
mineral
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 dominated)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz (Pebble)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (Quartz-rich sedimentary rock)
sedimentary
Sandstone (likely Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Amethyst
Silicon dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Placer Gold Nugget
Native Gold (Au)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (Gravel pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sapphire in a ring
Corundum (Al2O3)
mineral
Yellow Aventurine
Silicon Dioxide (Quartz with inclusions of Mica or Pyrite), SiO2
metamorphic
Dalmatian Jasper
Peralkaline rock with Tourmaline spots
igneous
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with Fe2O3)
sedimentary
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Flinty variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Pebble with Inclusion
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Vanadinite
Lead Chlorovanadate - Pb5(VO4)3Cl
mineral
Quartzite
Quartzite (mostly SiO2)
Metamorphic
Milky Quartz
Silicon dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Flint variety)
Silicon dioxide (SiO2)
sedimentary
Quartzite (with Metamorphic Foliation)
Quartzite (Recrystallized SiO2)
metamorphic