Sedimentary (Chemically Precipitated) Or Metamorphic

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky Variant)

Silicon Dioxide (SiO2)

Magnetite (Lodestone variety)

Magnetite (Fe3O4)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Green Jasper

Silicon Dioxide (SiO2) with impurities

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Porcelain (Kaolin-based)

Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)

Chert (often called Flint)

Silicon Dioxide (SiO2)

Chert (Iron-stained or Dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Chert (SiO2)

Chert (Flint) with Glauconite

Microcrystalline Quartz (SiO2)

Jasper, possibly Brecciated Jasper or Ocean Jasper due to patterns and color

Silicon Dioxide (SiO2), a variety of Chalcedony

Auriferous Quartz (Gold-bearing Quartz)

Silicon Dioxide (SiO2) with Elemental Gold (Au)

Quartz (Milky or Cloudy variety)

Silicon Dioxide (SiO2)

Gold Nugget

Native Gold (Au)

Gold

Native Gold (Au)

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Quartz (specifically Milky or Clear Chunk)

Silicon Dioxide (SiO2)

Gold and Cubic Zirconia (San Judas Tadeo Pendant)

Native Gold (Au) with Synthetic Cubic Zirconia (ZrO2)

Gold

Native Gold (Au)

Limonite/Goethite on Shale

Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock

Dendrite (Manganese Oxide Dendrites)

Psilomelane or Pyrolusite on Matrix (typically MnO2)

Limestone

Calcareous sedimentary rock (CaCO3)

Jasper-Quartz Conglomerate / Chert

Siliceous Sedimentary Rock (SiO2)

Chert Pebble

Microcrystalline Quartz (SiO2)

Quartzite

Quartzite (primarily SiO2)

Sandstone with Ironstone Banding

Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)

Chert (Flint variety)

Silicon Dioxide (SiO2)

Caliche (also known as hardpan, calcrete, kankar)

Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.

Chert (Smooth River Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Rough Green Tourmaline (Verdelite)

Elbaite (Complex Silicate) - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Chert (including Flint and Jasper variants)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Limestone

Sedimentary rock composed of Calcium Carbonate (CaCO3)

Chalcedony (Agate/Quartz variety)

Cryptocrystalline Quartz (SiO2)

Chert (Jasper-like Silicate)

Microcrystalline quartz (SiO2)