Limestone

Bivalve Fossil (Internal Mold)

Class Bivalvia (Phylum Mollusca)

Belemnoit Fossil (Sea Squid Fossil)

Belemnitida (Order within Cephalopoda)

Yellow Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (often called Flint or Jasper)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Chert (with Quartz vein/coating)

Microcrystalline Quartz (SiO2)

Chert (often called Jasper in this color variety)

Microcrystalline Quartz (SiO2)

Chert (Tan/Yellow variety)

Microcrystalline quartz (SiO2)

Chert (Jasper variation)

Chert (Silicate mineral, SiO2)

Chert (specifically Gray Chert)

Chert (SiO2)

Chert (often called Flint or Jasper based on color)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (variously known as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Banded Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Bivalve Fossil (Clam)

Class Bivalvia (Calcium Carbonate, CaCO3)

Chert (specifically Jasper/Brown Chert)

Silicon Dioxide (SiO2)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Chert (Yellow/Tan variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Chert (Nodular or Massive Variety)

Cryptocrystalline Quartz (SiO2)

Chert (Pebble)

Chert (Microcrystalline Quartz, SiO2)

Chert (with Desert Varnish/Iron Stain)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Yellow Chert (Jasper)

Microcrystalline Quartz (SiO2)

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (White Variety)

Silicon Dioxide (SiO2)

Chert (varieties include Flint and Jasper)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Jasper/Chalcedony)

Microcrystalline Quartz (SiO2)

Chert (Iron-rich or Jasperoid)

Cryptocrystalline Quartz (SiO2)

Bivalve Fossil (Shell Fragment)

Class Bivalvia (Calcium Carbonate - CaCO3)

Granite

Plutonic felsic igneous rock

Chert (variations include Flint/Jasper)

Cryptocrystalline Quartz (SiO2)

Chert

Chert (Microcrystalline Silica, SiO2)

Chert (specifically Jasper/Flint)

Chert (SiO2)

Chert (and Flint)

Silicon dioxide (SiO2)

Chert (including Flint and Jasper variants)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Light Grey / Flint variant)

Cryptocrystalline Quartz (SiO2)

Limonite-pseudomorph after Pyrite (Prophecy Stone)

Goethite and Limonite secondary minerals (FeO(OH)·nH2O) replacing Pyrite (FeS2)

Jasper (specifically Chert/Ironstone)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Chert (Jasper-rich)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Geode (Unopened)

Silica-rich Concretion (primarily SiO2)

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Ironstone variety)

Silicon Dioxide (SiO2) with iron oxide inclusions