Sedimentary

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Crinaudite / Fossilized Crinoid Stem

Crinoid (Echinodermata) in a Calcitic/Siliceous Matrix

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert / Flint (with Iron Staining)

Silicon Dioxide (SiO2)

Ironstone Concretion (Pot Stone)

Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)

Jasper

Silicon dioxide (SiO2) with iron oxide and clay inclusions

Glauconitic Sandstone

Glauconitic Quartz Arenite

Dendritic Jasper (River Stone)

Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions

Yellow Jasper

Silicon Dioxide (SiO2) - Opaque Chalcedony

Chert (and/or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Jasper or Flint variant)

Cryptocrystalline Quartz (SiO2)

Banded Chert

Microcrystalline Quartz (SiO2)

Ironstone Nodule (Ironstone Concretion)

Siderite-rich Mudstone (FeCO3) or Limonite (FeO(OH)·nH2O)

Siltstone with Weathering Rind

Siltstone (composed of microscopic quartz and clay minerals)

Quartz Geode

Quartz (Silicon Dioxide - SiO2) within a Chalcedony and Limonite shell

Chert (Smooth River Pebble)

Silicon Dioxide (SiO2)

Crinoid Fossil Stem Segment

Class Crinoidea (Echinodermata)

Coquina with Shell Fragment

Bioclastic Limestone (composed primarily of CaCO3)

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Red Jasper (River Siltstone)

Silicon Dioxide (SiO2) with iron oxide inclusions

Petrified Wood

Silicified Wood (SiO2)

Bauxite

Bauxite (Al2O3·2H2O)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Chert (Tan/Brown)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Jasper (Iron-rich)

Silicon Dioxide (SiO2) with Fe2O3 (Hematite) inclusions

Kambaba Jasper

Stromatolite (Fossilized Algae)

Jasper

Silicon Dioxide (SiO2) - Jasper (Microcrystalline Quartz)

Chert (Jasper variety) with Iron Oxide staining

Cryptocrystalline Quartz (SiO2) with Goethite/Limonite impurities

Coral Fossil (Favosites type)

Phylum Cnidaria, Class Anthozoa (often CaCO3 - Calcium Carbonate)

Chert (specifically Gray/Blue Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint or Jasper)

Silicon Dioxide (SiO2)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (variations include Flint or Jasper)

Chert (Silicon Dioxide, SiO2)

Picture Jasper

Tectonically broken chalcedony (SiO2)

Chert (Flint variety)

Microcrystalline context of Quartz (SiO2)

Kambaba Jasper

Stromatolite Jasper (Microcrystalline Quartz with Cyanobacteria fossile)

Septarian Nodule (Yellow Calcite in Limestone)

Septarian Concretion (CaCO3 with Aragonite and Calcite)

Sandstone (specifically Picture Sandstone or Wonderstone)

Arenite (composed primarily of SiO2)

Red Jasper

Silicon Dioxide (SiO2) - Opaque Chalcedony

Jasper Cross

Silicon Dioxide (SiO2) with iron oxide impurities