Sedimentary Mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Ferruginous Sandstone

Sandstone, Iron-rich

Dendritic Agate (specifically Orange/Tumbled)

Silicon Dioxide (SiO2) with Oxide Inclusions

Ironstone Concretion (Limonite/Goethite)

Goethite-rich Concretion (FeO(OH))

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Conglomerate

Conglomerate (clastic sedimentary rock)

Jasper

Jasper (Silicon Dioxide, SiO2)

Chert (Flint Nodular)

Chert (Silicon dioxide, SiO2)

Raw Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Dalmatian Jasper

Peralkaline rhyolite

Travertine (often colloquially called Tufa)

Chemical Sedimentary Calcium Carbonate (CaCO3)

Bumblebee Jasper

Calcite-Auripigment-Pyrite-Realgar assemblage (Carbonate/Sulphide mixture)

Chert (and Petrified Wood)

Silicon Dioxide (SiO2)

Gneiss (Metamorphic Cobble)

Gneiss

Bumble Bee Jasper

Calcite-bearing Volcanic Tuff (not a true Jasper)

Moqui Marble (Moqui Ball)

Ironstone Concretion (Goethite/Hematite cemented Sandstone)

Picture Jasper

Silicon Dioxide (SiO2) - Opaque Chert/Quartzite variety

Sandstone (Muddy/Silty Variety)

Arenite with high silt/clay content (clastic sedimentary rock)

Green Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Ammonite Fossil

Ammonoidea (subclass)

Chert Nodule

Microcrystalline Silica (SiO2)

Ironstone Concretion / Goethite Nodules

Ironstone (composed primarily of Goethite FeO(OH) and Limonite)

Milky Quartz

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Grey Jasper (Tumbled Quartz variant)

Jasper (Silicon Dioxide, SiO2)

Septarian Nodule (Dragon Stone)

Septarian concretion (composition: Calcium Carbonate / Calcite, Aragonite, and Limestone/Clay)

Garnet Schist or Garnet-bearing Quartzite

Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)

Jasper (specifically Owyhee or Picture Jasper variety)

Jasper (Silicon Dioxide, SiO2)

Sandstone

Arenite (SiO2 primarily)

Coquina / Shelly Limestone

Coquina (calcium carbonate, CaCO3)

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Jasper

Silicon dioxide (SiO2)

Sandstone (with Iron Siderite Concretion)

Arenite with Ironstone Concretion (FeCO3)

Ocean Jasper

Silicon dioxide with impurities (SiO2 + impurities)

Jasper Breccia

Silicon Dioxide (SiO2) - Brecciated Microcrystalline Quartz

Jasper

Silicon dioxide (SiO2) with impurities

Sandstone (Red)

Arenite (SiO2 with Fe2O3)

Chert (Nodule / Geode fragment)

Microcrystalline Quartz (SiO2)

Granite Gneiss

Gneiss (High-grade regional metamorphic rock)

Calcite

Calcium Carbonate (CaCO3)