Sedimentary (Fossilized)

Chert / Flint

Silicon dioxide (SiO2)

Chert (and Chert Geode)

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Chert (often referred to as Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert / Greenstone

Silicon Dioxide (SiO2) with impurities

Jasper

Silicon dioxide (SiO2)

Chert (Lake Superior Agate variant)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Coquina

Biogenic Limestone (Calcium Carbonate - CaCO3)

Yellow Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2) with iron oxide (Limonite/Goethite) inclusions

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Red Jasper

Silicon dioxide (SiO2) with hematite impurities

Chert (Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxide impurities

Chert (Jasper/Flint variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Chert (Flint Nodules)

Cryptocrystalline Quartz (SiO2)

Chert (and Limestone)

Chert (consisting of Microcrystalline Quartz, SiO2)

Dyed Imperial Jasper (Sea Sediment Jasper)

Silicon Dioxide (SiO2) - Impure Quartz/Chalcedony

Veined Limestone (Micrite) with Quartz/Calcite Veins

Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions

Jasper (Mookaite style)

Jasper (Silica-rich Microcrystalline Quartz, SiO2)

Septarian Nodule (Dragon Stone)

Septarian Concretion (CaCO3 with Siderite and Calcite)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Limonite Concretion

Limonite (FeO(OH)·nH2O)

Gray Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Chert (with Quartz vein)

Chert (Silicon Dioxide, SiO2)

Jasper (Iron Oxide Rich)

Silicon Dioxide (SiO2) with Fe2O3 (Hematite/Goethite) inclusions

Chert (often called Flint or Jasper when red)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Bauxite

Alumina-rich rock (consisting of Gibbsite, Boehmite, and Diaspore)

Red Sandstone

Sandstone (mainly SiO2 with Iron Oxide cement)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Yellow Jasper (Chert)

Silicon Dioxide (SiO2)

Moqui Marble

Ironstone Concretion (Limonite/Hematite over Sandstone)

Banded Iron Formation (BIF) / Tiger Iron variety

Banded Iron Formation (composed primarily of Magnetite Fe3O4, Hematite Fe2O3, and Chert/Quartz SiO2)

Chert (White Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint Nodules)

Silicon Dioxide (SiO2)

Banded Iron Formation (BIF) / Jasper

Banded Iron Formation (SiO2 with Fe2O3 and Fe3O4)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (Chert Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint or Jasper)

Cryptocrystalline quartz (SiO2)

Coquina

Bioclastic Limestone