Mineral (Cryptocrystalline Quartz)

Blue Chalcedony (likely dyed)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Banded Agate (specifically Moss Agate or Plume Agate variety)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Banded Chalcedony (Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Agate

Agate (a cryptocrystalline variety of Quartz, SiO₂)

Banded Agate (Lace Agate)

Agate (Variety of Cryptocrystalline Quartz), SiO2

Banded Agate (specifically Sardonyx or Carnelian Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Blue Lace Agate

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Banded Agate (specifically Red Agate or Sardonyx variety)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Blue Chalcedony

Chalcedony (Silicon Dioxide, SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Common Opal/Agate inclusion)

Microcrystalline Quartz (SiO2)

Chert (specifically a stream-worn Chert Nodule)

Sedimentary Cryptocrystalline Quartz (SiO2)

Chalcedony (Quartz Nodule)

Silicon Dioxide (SiO2)

Chert (Common Opal/Jasper variety)

Cryptocrystalline Quartz (SiO2)

Chert (specifically Brown Chert or Flint)

Cryptocrystalline Quartz (SiO2)

Chert (varietal: Flint/River Pebble)

Cryptocrystalline Quartz (SiO2)

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Chert (often called Flint or Jasper)

Cryptocrystalline quartz (SiO2)

Chert and Chalcedony

Cryptocrystalline Quartz (SiO2)

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Chert (Common Variety)

Cryptocrystalline Quartz (SiO2)

Chert (specifically Jasper or Flint)

Cryptocrystalline Quartz (SiO2)

Banded Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Chert (Heart-shaped Pebble)

Cryptocrystalline quartz (SiO2)

Chert (variations include Flint or Jasper)

Cryptocrystalline Quartz (SiO2)

Chert (Jasper-like)

SiO2 (Cryptocrystalline Quartz)

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Chert (Flint Nodules)

Cryptocrystalline Quartz (SiO2)

Chert (varietal: Flint Pitted Pebble)

Cryptocrystalline Quartz (SiO2)

Flint (Chert)

Cryptocrystalline Quartz (SiO2)

Chert (Jasper variety)

Cryptocrystalline quartz (SiO2)

Chert (specifically Flint)

Cryptocrystalline Quartz (SiO2)

Rough Agate/Chert Nodules

Cryptocrystalline Quartz (SiO2)

Flint (or Chert)

Cryptocrystalline Quartz (SiO2)

Banded Chert

Cryptocrystalline Quartz (SiO2)

Chert (specifically Flint or Jasper variant)

Cryptocrystalline Quartz (SiO2)

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Chert (and Flint)

Cryptocrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Chrysocolla

Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O

Chert (also known as Flint or Common Chalcedony)

Cryptocrystalline Silica (SiO2)