Sedimentary Rock (Specifically A Chemical Sedimentary Rock, Or A Chert If Considered Purely Mineral Aggregate)

Chert (specifically Flint or Common Chert)

Chert (Cryptocrystalline Silica, SiO2)

Pyrite-rich Ore

Pyrite (FeS2) with secondary minerals

Sandstone Pebble with Iron Staining

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)

Chert (with Quartz veins)

Microcrystalline Quartz (SiO2)

Chert (specifically Brown Chert or Flint)

Cryptocrystalline Quartz (SiO2)

Chert (specifically Flint or Common Chert)

Silicon Dioxide (SiO2)

Chert (Brecciated or Veined)

Silicon Dioxide (SiO2)

Red Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (and associated Flint)

Silicon Dioxide (SiO2)

Chert (specifically Gray/Tan Chert Node)

Microcrystalline Quartz (SiO2)

Sandstone (River Pebble)

Arenite (primarily SiO2)

Chert (specifically a Worked Flint/Knapped Flake)

Chert / Flint (Microcrystalline Quartz, SiO2)

Chert (Iron-Stained)

Microcrystalline Silica (SiO2)

Chert / River Jasper

Microcrystalline Quartz (SiO2)

Green Jasper (Chert)

Silicon Dioxide (SiO2)

River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)

Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)

Chert (often called Flint or Jasper)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Limestone with Chert Nodules

Sedimentary Calcium Carbonate (CaCO3) with Microcrystalline Silica (SiO2) inclusions

Chert (specifically Flint or Jasper variant)

Silicon Dioxide (SiO2)

Fossiliferous Chert (with Brachiopod or Mollusk fragments)

Silicon dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions

Chert (often called Jasper or River Siltstone)

Chert (SiO2)

Chert / Jasper

Silicon Dioxide (SiO2)

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Chert (specifically Flint or Chalcedony nodule)

Microcrystalline Quartz (SiO2)

Chert (Honey Chert or Chalcedony Pebble)

Cryptocrystalline Quartz (SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide - SiO2)

Chert (specifically a flint nodule component)

Microcrystalline quartz (SiO2)

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Amethyst (Chevron Amethyst)

Amethystine Quartz (SiO2)

Chert

Chert (microcrystalline quartz, SiO2)

Chert / Flint Nodules in Sandstone

Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock

Chert (Gravel Bit)

Microcrystalline silica (SiO2)

Chert (specifically Flint or Gray Chert)

Silicon Dioxide (SiO2)

Chert (also known as Flint or Common Chalcedony)

Cryptocrystalline Silica (SiO2)

Banded Chert (or Flint)

Microcrystalline Quartz (SiO2)

Chert (Brecciated Chert)

Silicon Dioxide (SiO2)

Chert (includes Flint & Jasper)

Chert (Siliceous sedimentary rock, chemical formula SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)