Sedimentary (Physico Chemical)

Jasper (specifically Green Jasper/Chert)

Jasper (Silicon Dioxide, SiO2)

Chert (and Chert-Jasper mix)

Microcrystalline Quartz (SiO2)

Chert (Common Variety)

Cryptocrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Chert (often called Flint or Jasper depending on color)

Chert (SiO2 - Microcrystalline or Cryptocrystalline Quartz)

Jasper or Agate-bearing Chert

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2)

Bauxite

Bauxite (Al2O3·nH2O)

Limonite (Iron Stone Concretion)

Limonite (Hydrous Iron Oxide) - FeO(OH)·nH2O

Chert (variations include Flint or Jasper)

Cryptocrystalline Quartz (SiO2)

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 (Jasper variation)

Silicon Dioxide (SiO2)

Chert (Flint Nodules)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Jasper or River Siltstone)

Microcrystalline Quartz (SiO2)

Chert (Jasper-rich)

Microcrystalline/Cryptocrystalline Quartz (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Banded Chert (Jasper)

Silicon Dioxide (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)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Halite (Rock Salt)

Halite (NaCl)

Orange Calcite with Siderite/Iron Oxide Coating

Calcium Carbonate (CaCO3)

Bauxite

Al2O3·2H2O (principally composed of gibbsite, boehmite, and diaspore)

Chert (Flint variety)

Chert (Cryptocrystalline Quartz, SiO2)

Sandstone (with Liesegang rings or Oxidation)

Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)

Chert / Greenstone

Silicon Dioxide (SiO2) with impurities

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Chalcedony)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (and Flint)

Chert (SiO2)

Chert (Jasper/Brown Chert)

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Glauconitic Sandstone

Glauconitic arenite (contains (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Mudstone)

Microcrystalline Quartz (SiO2)