Anthropogenic Material (Man Made Sedimentary Mimic)

Chert (specifically Flint or Common Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Ventifact

Eolian Ventifact (often composed of basalt, chert, or quartzite)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Agate (specifically a small Chalcedony nodule)

Agate (Cryptocrystalline variety of Quartz, SiO2)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Chert (Cherty Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Banded Chert

Microcrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Chert (Jasper/Flint Pebble)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Pyrite (on host rock)

Iron Sulfide (FeS2)

Milky or Iron-Stained Quartz

Quartz (Silicon Dioxide, SiO2)

Banded Gneiss

Gneiss (High-grade metamorphic rock)

Chert (often called Jasper in this color variety)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Red Jasper

Jasper (Silicon Dioxide, SiO2 with Fe2O3 inclusions)

Chert (Flint variety)

Silicon Dioxide (SiO2)

Chert (Iron-stained or Dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Black Flint)

Silicon Dioxide (SiO2)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint Nodules)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert

Chert (Microcrystalline Quartz, SiO2)

Chert (Chert / Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Amber (Copal)

Organic gemstone, fossilized tree resin (often immature amber or copal)

Pyrite

Iron Sulfide (FeS2)

Chert (often colloquially referred to as Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Fossiliferous Limestone

Calcite-rich Sedimentary Rock (CaCO3)

Coquina / Fossiliferous Limestone

Calcite-rich Bioclastic Sedimentary Rock (CaCO3)

Chert (Jasper/Iron-stained Quartzite)

Silicon Dioxide (SiO2)

Coquina

Biogenic Limestone (Calcium Carbonate, CaCO3)

Banded Chert

Microcrystalline Quartz (SiO2)

Siltstone

Siltstone (primarily SiO2 with Al2O3 and Fe2O3)

Sandstone with trace fossil

Sandstone, possibly with Skolithos or similar trace fossil