Antropogenic (Man Made Material)

Prase Quartz on Feldspar

Quartz (Silicon Dioxide, SiO2) with Hedenbergite inclusions on Potassium Feldspar (KAlSi3O8)

Slag (Industrial Glassy Byproduct)

Anthropogenic silicate byproduct (Slag)

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

Quartz (Pebble)

Quartz (SiO₂)

Diamond (or Diamond Simulant/Cubic Zirconia)

Carbon (C) - if diamond, or Zirconium dioxide (ZrO2) - if Cubic Zirconia

Chert / Jasper

Microcrystalline Quartz (SiO2)

Diamond (in Jewelry Setting)

Carbon (C) - Isometric-Hexoctahedral

Chert / Jasper

Microcrystalline Quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (Jasper/Chalcedony)

Microcrystalline Quartz (SiO2)

Chert / Flint

Silicon Dioxide (SiO2)

Kaolinite (Chalky Clay)

Kaolinite (Al2Si2O5(OH)4)

Sandstone (with biological crust)

Arenite (SiO2 based)

Amethyst Geode (Thunderegg)

Silicon Dioxide (SiO2) - Quartz Variety: Amethyst

Siltstone

Siltstone (primarily composed of SiO2 with various clay minerals)

Gold Nugget

Native Gold (Au)

Sandstone (Stream-rounded Cobble)

Arenite (composed primarily of SiO2, Silica)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)

Sandstone (likely Ferruginous)

Arenite (SiO2 with iron oxide impurities)

Sandstone (Ferruginous)

Arenite (Fe2O3 enriched)

Arfvedsonite with Garnet

Na3(Fe2+,Mg)4Fe3+Si8O22(OH)2

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock - Arenite

Jasper River Stone

Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxides

Sandstone (likely Siltstone or fine-grained Sandstone)

Sedimentary Rock (Clastic)

Yellow Quartzite (River Pebble)

Quartzite (primarily Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Quartzite Pebble

Quartzite (mostly SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Sandstone (likely Arkose or Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Calcareous Sandstone)

Calcareous Sandstone (primarily SiO2 with CaCO3 cement)

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood

Silicified Wood (SiO2)

Breciated Limestone with Calcite Veins

Sedimentary Breccia (CaCO3)

Sandstone

Arenite (SiO2 principal)

Quartz-veined Siltstone

Siltstone with Quartz (SiO2) veins

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Sandstone (Ferruginous)

Arenite (with Iron Oxides)

Milky Quartz with Mica inclusions

Quartz (Silicon Dioxide, SiO2)

Stromatolite (Jasper-replaced)

Fossilized Stromatolite (Cyanobacteria / Cryptozon / Silica SiO2)