Quartzite
Quartzite (primarily SiO2)
metamorphic
Category
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Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (likely Rose Quartz or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (often called Flint)
Microcrystalline quartz (SiO2)
sedimentary
Green Tiger's Eye
Quartz (SiO2) with fibrous crocidolite inclusions (dyed)
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Amethyst
Silicon Dioxide with iron impurities (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Crystal (Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (Arrowhead artifact)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper-rich)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (principally Silicon Dioxide, SiO2)
metamorphic
Chert (Banded)
Cryptocrystalline Silica (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst Geode
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Banded Chert or Unakite-like Rock
Epidotized Granulite or Jasperoid Chert
metamorphic
Red Sandstone
Arenite (SiO2 with Iron Oxide impurities)
sedimentary
Milky Quartz with Fuchsite inclusion
Silicon Dioxide (SiO2) with Chromium-rich Muscovite
metamorphic
Chert (Common Opal/Jasper mix)
Silicon Dioxide (SiO2) with impurities
sedimentary
Sandstone (Ferruginous Concretion)
Arenite (with iron oxide cement)
sedimentary
Vesicular Basalt
Vesicular Basalt
igneous
Chalcedony (Carnelian Agate)
Cryptocrystalline quartz (SiO2) with Iron Oxide inclusions
sedimentary
Quartzite Pebble
Meta-quartzite (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral