Mineral (Specifically A Cryptocrystalline Variety Of Quartz)

Jasper

Silicon Dioxide (SiO2)

Chert (specifically Gray Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Mushroom Carving

Quartz (Silicon Dioxide, SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Chert (White-Tan variety)

Silicon dioxide (SiO2) / Microcrystalline Quartz

Milky Quartz with inclusions

Silicon Dioxide (SiO2)

Amazonite

Amazonite (K[AlSi3O8])

Granite (Pink Orthoclase variety)

Phaneritic intrusive igneous rock (Quartz, Orthoclase, Plagioclase, and Mica)

Agate Nodule / Weathered Agate

Silicon Dioxide (Chalcedony / Quartz, SiO2)

Sandstone

Arenite (specifically Quartz Arenite)

Chert

Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Tumbled carnelian/chalcedony

Cryptocrystalline quartz, SiO₂ (iron-bearing chalcedony)

Amazonite

Microcline (K(AlSi3O8))

Green Aventurine

Quartz with fuchsite inclusions (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Blue lace agate (tumbled)

Microcrystalline quartz, SiO₂ (chalcedony variety)

Yellow Quartz (Citrine appearance)

Silicon Dioxide (SiO2)

Quartz (Druzy or Crystalline)

Silicon Dioxide (SiO2)

Polished yellow jasper or opaque chalcedony bead

Microcrystalline quartz (SiO₂), likely iron-oxide-stained jasper

Chert / Flint Pebble

Cryptocrystalline Quartz (SiO2)

Agate (Chert/Chalcedony)

Cryptocrystalline Quartz (SiO2)

Tumbled carnelian/chalcedony

Chalcedony (microcrystalline quartz), SiO₂; reddish color from iron oxides

Blue Chalcedony (Tumbled)

Silicon Dioxide (SiO2)

Banded Carnelian Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Carnelian (Red Chalcedony)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Epidosite with Quartz (Unakite-variant or Jasper)

Epidotized Metasomatite

Mixed collection of Quartz varieties, Chalcedony, and metamorphic pebbles

Mixed gemstones (primarily Silicon Dioxide - SiO2)

Banded Agate (specifically Mexican Lace Agate variety appearance)

Silicon Dioxide (SiO2 / Chalcedony)

Chert (specifically Flint or Common Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically White Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Black Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Flint or Common Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically White Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

White Quartz Pebble

Silicon Dioxide (SiO2)

Polished brown jasper (likely ocean or brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides