Sedimentary (Physico Chemical Precipitate)

Chert (Common Variety)

Cryptocrystalline Quartz (SiO2)

Chert (and Chert-Jasper mix)

Microcrystalline Quartz (SiO2)

Limonite Concretion

Limonite (FeO(OH)·nH2O)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Jasper or Agate-bearing Chert

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2)

Chert (often called Flint or Jasper depending on color)

Chert (SiO2 - Microcrystalline or Cryptocrystalline Quartz)

Septarian Nodule or Mud Crack Fossil

Septarian Nodule (Concretion)

Limestone

Calcium Carbonate (CaCO3)

Banded Calcite (often sold as Mexican Onyx or Aragonite)

Calcite/Aragonite (Calcium Carbonate, CaCO3)

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Brecciated Chert

Sedimentary Chert (SiO2) with Calc-Silicate mineralization

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode form

Chert (Jasper/Black Chert)

Silicon Dioxide (SiO2)

Chert / Flint Nodules in Sandstone

Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock

Chert (Flint Nodules)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper variation)

Silicon Dioxide (SiO2)

Chert (often called Jasper or River Siltstone)

Microcrystalline Quartz (SiO2)

Chert (Jasper-rich)

Microcrystalline/Cryptocrystalline Quartz (SiO2)

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Chert (specifically Flint or Common Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically White Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Druzy Quartz (on Geode Fragment)

Silicon Dioxide (SiO2)

Chert (River Pebble)

Microcrystalline silicon dioxide (SiO2)

Bumble Bee Jasper

Calcite-bearing Volcanic Tuff (not a true Jasper)

Chert (Red/Brown Variety)

Microcrystalline quartz (SiO2)

Satin Spar (Gypsum)

Hydrous Calcium Sulfate (CaSO4·2H2O)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Chert (and/or Flint)

Microcrystalline Quartz (SiO2)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline silica (SiO2) with trace Iron oxide (Fe2O3)

Chert (with Limonite staining)

Microcrystalline Quartz (SiO2)

Chert (specifically Brown Chert or Flint)

Cryptocrystalline Quartz (SiO2)

Chert (Arrowhead variety)

Chert (SiO2)

Chert (Flint)

Microcrystalline or cryptocrystalline quartz (SiO2)

Chert (often called Flint)

Microcrystalline Quartz (SiO2)

Chert (Cherty Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (and Limestone)

Chert (consisting of Microcrystalline Quartz, SiO2)