Sedimentary (Fossilized Organic Matter)

Jasper (specifically Yellow Jasper and Red Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (Cherty Flint/Jasper variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Banded Variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone

Arenicola (comprising mostly Quartz, SiO2)

Petrified Wood

Silicified Wood (SiO2)

Limestone (Weathered)

Calcium Carbonate (CaCO3)

Jasper with Quartz Vein

Silicon Dioxide (SiO2) with impurities

Chert (Jasper/Mudstone)

Silicon Dioxide (SiO2)

Chert (specifically Jasper or Flint variant)

Microcrystalline Quartz (SiO2)

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Chert (White Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Tan/Buff Chert)

Microcrystalline Quartz (SiO2)

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert (often colloquially referred to as Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Chert (Nodule)

Chert (primarily Microcrystalline Quartz - SiO2)

Banded Chert

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Chert (vuggy variety)

Microcrystalline silica (SiO2)

Chert (Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Chert Pebble (with Quartz Vein)

Chert (Cryptocrystalline Silica - SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Smooth River Pebble)

Silicon Dioxide (SiO2)

Chert (specifically River Stone / Jasper variety)

Microcrystalline Quartz (SiO2)

Chert (specifically Yellow Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Jasper

Jasper (Silicon Dioxide, SiO2)

Chert (variant Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Crushed Limestone

Calcite-rich Sedimentary Rock (CaCO3)

Chert (Iron-stained)

Chert (primarily Microcrystalline Quartz, SiO2)

Chert (Tan/Grey variety)

Silicon Dioxide (SiO2)

Chert (often called Flint or Jasper locally)

Chert (Microcrystalline Quartz, Formula: SiO2)

Chert (and/or Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (specifically Iron-stained or Jasperoid Chert)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily Chalcedony/Quartz, SiO2)

Chert (specifically Flint or Common Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert / Flint Nodules

Cryptocrystalline Quartz (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper/Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Black Flint)

Silicon Dioxide (SiO2)

Chert (Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Banded Chert

Microcrystalline Quartz (SiO2)