Sedimentary Rock (Technically Chert, A Microcrystalline Quartz)

Chert with Desert Varnish

Cryptocrystalline Quartz (SiO2) with Manganese/Iron oxide coating

Flint / Chert

Silicon dioxide (SiO2)

Chert (with Quartz veins)

Microcrystalline Quartz (SiO2)

Banded Chert (or Flint)

Microcrystalline Quartz (SiO2)

Chert Pebble

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Nodule)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Jasper/Agate variety)

Cryptocrystalline Quartz (SiO2)

Jasper Chert Nodules

Silicon Dioxide (SiO2) with Hematite impurities

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2) with iron oxide impurities

Banded Chert

Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)

Chert (varieties include Flint and Jasper)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Quartzite with Chert inclusions

Metamorphosed Quartz-rich Rock (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline Quartz (SiO2)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Bauxite

Al2O3·2H2O (principally composed of gibbsite, boehmite, and diaspore)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (variations include Flint or Jasper)

Chert (chemical sedimentary rock), Quartz (SiO2)

Chert (Smooth River Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Jasper/Chalcedony variety)

Microcrystalline Quartz (SiO2)

Chert (specifically a fragment with Desert Varnish)

Microcrystalline quartz (SiO2)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Holey Stone)

Microcrystalline Quartz (SiO2)

Chert (with Liesegang Banding)

Microcrystalline quartz (SiO2)

Chert (and/or Siltstone River Pebble)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Yellow Quartz (Chalcedony)

Silicon Dioxide (SiO2)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Banded Chert (Agate-like Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (River Cobble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Polished Gemstone / River Stone)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint or Jasper depending on color)

Chert (SiO2 - Microcrystalline or Cryptocrystalline Quartz)

Chert / Jasper / Agate (Chalcedony Group)

Microcrystalline Quartz (SiO2)

Banded Chert

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Nodule/Pebble)

Chert (Silicon Dioxide, SiO2)

Chert (White-Tan variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Yellow/Tan Variety)

Chert (SiO2)