Mineral Based Composite

Sandstone

Arenite (SiO2 based with various cements)

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (SiO2 based)

Sandstone (Quartz-rich)

Arenite (SiO2 based clastic rock)

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone with Iron Staining

Arenite (SiO2 based with Fe2O3 staining)

Diamond Drill Core (Greenschist and Quartzite)

Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)

Sandstone (Banded Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with iron oxide impurities)

Banded calcite (onyx marble)

Calcite, CaCO₃; commonly sold as “honey onyx” or “Pakistan onyx”

Pink Quartz / Sea Glass

Silicon Dioxide (SiO2)

Banded Calcite (Green Onyx)

Calcium Carbonate (CaCO3)

Milky Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Conglomerate

Clastic sedimentary rock (Puddingstone)

Sandstone (Weathered)

Arenite (primarily SiO2)

Limonite

Limonite (Hydrated iron(III) oxide-hydroxide) FeO(OH)·nH2O

Asphalt / Bituminous Aggregate

Bituminous mixture (Hydrocarbon-based sediment)

Sandstone (Red Sandstone)

Arenite (SiO2 based with Fe2O3 staining)

Amethyst

Quartz (Silicon Dioxide with iron impurities), SiO2

Jasper Pendant

Chalcedony (Quartz) - SiO2

Red Sandstone

Arenite (with Iron Oxide / Hematite cementation)

Sandstone

Sandstone (Quartz-rich Arenite / SiO2)

Sandstone

Arenite (SiO2 based with quartz grains)

Pink Feldspar / Rhodochrosite (Tumbled Pink Quartzite)

SiO2 (Quartz) / KAlSi3O8 (Potassium Feldspar)

Coal (Anthracite / Bituminous)

Organic Sedimentary Rock (Carbon-based)

Feldspar (specifically Orthoclase)

Potassium Aluminum Silicate (KAlSi3O8)

Gold Nugget

Native Gold (Au)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Gold Nugget

Gold (Au)

Gold

Native Gold (Au)

Gold Nugget

Native Gold (Au)

Gold Nugget

Native Gold (Au)

Slate

Foliated Metamorphic Rock (primarily composed of quartz, illite, chlorite, and micas)

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

Rhodonite

Manganese silicate (Mn,Fe,Mg,Ca)SiO3

Sandstone

Arenite (SiO2 based clastic rock)

Travertine

Terrestrial Sedimentary Rock (CaCO3)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Cubic Zirconia (Faceted)

Zirconium Dioxide (ZrO2)

Banded Calcite (Mexican Onyx)

Calcite (Calcium Carbonate, CaCO3)

Sandstone

Arenite (primarily SiO2)

Granite Pegmatite

Coarse-grained Granite (SiO2 - Aluminum and Alkalies)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Limestone or Sandstone Cobble

Sedimentary rock (Calcium carbonate or Quartz based)