Sedimentary (Processed Mineral Product)

Quartz River Cobble

Silicon Dioxide (SiO2)

Quartz (Druzy on Matrix)

Silicon Dioxide (SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Red Jasper (Chert)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Petrified Wood

Silicified Wood (SiO2)

Limonite (with Goethite/Ironstone)

FeO(OH)·nH2O (Hydrated Iron Oxide)

Green Aventurine

Silicon Dioxide (Quartz) with inclusions of Fuchsite mica (K(Al,Cr)2(AlSi3O10)(OH)2)

Petrified Wood

Silicified Wood (SiO2)

Hematite

Iron (III) Oxide, Fe2O3

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Chert (Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Septarian Nodule (Polished)

Septarian concretion (Calcite, Aragonite, Limestone)

Petrified Wood

Siliconized Wood (SiO2)

Banded Sandstone

Arenite (composed primarily of Quartz: SiO2)

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite and Quartz inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with Iron inclusions

Dream Amethyst (Chevron Amethyst)

Silicon Dioxide (SiO2) with iron impurities and gamma radiation exposure

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (primarily Quartz or Chalcedony, SiO2)

Quartz Pebble

Crystalline Silica (SiO2)

Buffalo Nickel (Indian Head Nickel)

Cupronickel (75% Copper, 25% Nickel)

Ferruginous Breccia

Breccia with Iron-rich (Hematite/Goethite) Matrix

Sandstone (Ferruginous)

Arenite (with iron oxide cement)

Polychrome Jasper

Silicon Dioxide (SiO2) with iron and other mineral inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Jasper (likely river-worn)

Silicon Dioxide (SiO2)

Water and Silt (Sedimentary Environment)

Suspended Sediment / H2O (dihydrogen monoxide)

Quartz River Pebbles

Silicon Dioxide (SiO2)

Specular Hematite Geode/Nodule

Specularite (Polycrystalline Hematite), Fe2O3

Dyed Agate

Silicon Dioxide (SiO2) with artificial colorants

Gold Nugget

Native Gold (Au)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Jasper

Silicon Dioxide (SiO2) with impurities

Iron Gossan (Limonite/Goethite)

Hydrated Iron Oxides (FeO(OH)·nH2O) from oxidation zones

Hematite

Iron(III) oxide (Fe2O3)

Dyed Chalcedony (Agate)

Silicon Dioxide (SiO2) with artificial pigment

Quartz Pebble (Geode-like)

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Hag Stone

Porous sedimentary rock (typically Flint, Chert, or Sandstone) with naturally occurring holes

Petrified Wood

Silicified Wood (SiO2)