Organic (Non Geological)

Chert (Common Opal/Jasper variety)

Microcrystalline Quartz (SiO2) with hydration

Ferruginous Sandstone (with possible trace fossils)

Arenite with Iron-Oxide Cement (SiO2 with Fe2O3)

Jasper with Quartz Vein

Silicon Dioxide (SiO2) with impurities

Yellow Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2) with iron oxide (Limonite/Goethite) inclusions

Chert (varietal: Jasper or Flint)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Chert (Pink Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (Quartz Variety)

Silicon Dioxide (SiO2)

Chert (with Quartz Vein)

Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)

Chert (often called Flint or Jasper)

Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert (specifically Tan/Yellow Chert)

Silicon Dioxide (SiO2)

Chert (variations include Flint or Jasper)

Silicon Dioxide (SiO2)

Chert (and/or Flint)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Banded Chert

Microcrystalline Quartz (SiO2)

Chert (Jasper/Agate variety)

Silicon Dioxide (SiO2)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chalcedony (Botryoidal or Tumbled)

Chalcedony (SiO₂)

Chert (Iron-stained)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide

Granite

Phaneritic Plutonic Felsic Rock (primarily Quartz (SiO2), Alkali Feldspar, and Plagioclase Feldspar)

Moss Agate

Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide

Chert Pebble (Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (often called Jasper or River Rock)

Chert (SiO2)

Chert (Jasper/Black Chert)

Silicon Dioxide (SiO2)

Chert (often called Flint in this context)

Silicon Dioxide (SiO2)

Chert / Flint Nodules

Cryptocrystalline Quartz (SiO2)

Red Jasper

Microcrystalline Quartz (SiO2) with Hematite impurities

Agatized Chert / Chalcedony

Silicon Dioxide (SiO2)

Chert (often called Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Flint or Common Chert)

Microcrystalline Quartz (SiO2)

Chert (Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Yellow/Honey Jasper variety)

Cryptocrystalline Quartz (SiO2)

Limonite-stained Chert

Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Red Chert (Jasper)

Silicon Dioxide (SiO2)

Carnelian (Orange Chalcedony)

Silicon Dioxide (SiO2)