Sedimentary (Chemically Precipitated)

Chert (Septarian Nodules-like)

Silicon dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Chert (Iron-stained)

Silicon Dioxide (SiO2)

Banded Chert

Microcrystalline Quartz (SiO2)

Chert Pebble with Quartz Veins

Microcrystalline Quartz (SiO2)

Chert (Black Chert)

Microcrystalline Silica (SiO2)

Banded Onyx (Cave Calcite)

Calcite (CaCO3), often called Mexican Onyx or Travertine

Banded Chert

Microcrystalline Quartz (SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Banded Iron Formation (BIF) with Quartz

Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Jasper

Microcrystalline Quartz (SiO2)

Banded Chert (Jasper) River Pebble

Microcrystalline Quartz (SiO2)

Ferruginous Quartz

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

Honey Calcite

Calcium Carbonate (CaCO3)

Calcite

Calcium Carbonate (CaCO3)

Aragonite Star Cluster

Aragonite (Calcium Carbonate, CaCO3)

Chert (River Pebble)

Chert (Cryptocrystalline Quartz, SiO2)

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)

Yellow Jasper / Chert

Silicon Dioxide (SiO2) with Goethite or Limonite inclusions

Sandstone (Ferruginous Concretion)

Arenite (with iron oxide cement)

Chert (with Quartz vein/coating)

Microcrystalline Quartz (SiO2)

Chert with Jasper/Quartz Inclusions

Silicon Dioxide (SiO2)

Chert (Jasper/Quartzite river pebble)

Microcrystalline Silica (SiO2)

Chert (Red Jasper)

Microcrystalline Quartz (SiO2)

Chert (White Variety)

Silicon Dioxide (SiO2)

Calcite

Calcium Carbonate (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Chert Nodule

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Tufa

Calcium carbonate (CaCO3) - Porous Limestone

Banded Iron Formation (BIF)

Magnetite-hematite-chert formation

Jasper

Silicon Dioxide (SiO2), Microcrystalline Quartz

Quartz Geode with Chalcedony

Silicon Dioxide (SiO2)

Quartz Geode (Unbroken)

Silicon Dioxide (SiO2)

Green Jasper / Chert Pebbles

Microcrystalline Quartz (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Blue Calcite Sphere

Calcium Carbonate (CaCO3)

Optical Calcite

CaCO3 (Calcium Carbonate)

Pyrite

Iron Sulfide (FeS2)

Quartz

Silicon Dioxide (SiO2)