Man Made Material (Metal)

Red Sandstone

Arenite (with Iron Oxide / Hematite), Formula: SiO2 (Quartz) + Fe2O3 (Hematite coating)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (primarily SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

Cloudy Quartz

Quartz (Silicon Dioxide, SiO2)

Limestone

Calcium Carbonate (CaCO3)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Cinnabar in Quartz

Silicon Dioxide (Quartz, SiO2) with Mercury Sulfide inclusions (Cinnabar, HgS)

Sandstone (Quartzose Sandstone)

Arenite (SiO2 principal component)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Gemstone Sand (Mineral Assortment)

Mixed Mineral Concentrates (Commonly including Quartz SiO2, Garnet X3Y2(SiO4)3, and Tourmaline (Na,Ca)(Li,Mg,Al)3(Al,Fe,Mn)6(BO3)3(Si6O18)(OH,F)4)

Sodalite

Sodalite (Sodium Aluminum Silicate Chloride) - Na8(Al6Si6O24)Cl2

Hematite

Iron(III) oxide (Fe2O3)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Limonite-stained Chert/Jasper

Microcrystalline Quartz (SiO2) with Iron Oxides (FeO(OH)·nH2O)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Quartzite-rich)

Clastic sedimentary rock (SiO2 primary)

Grey Quartzite Pebble

Quartzite (primarily SiO2)

Brecciated Chert

Sedimentary Chert (SiO2) with Calc-Silicate mineralization

Conglomerate

Conglomerate (clastic sedimentary rock)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 principal composition)

Fossiliferous Limestone

Biogenic Calcium Carbonate (CaCO3)

Granite / Gneiss Complex

Felsic Plutonic Rock (Granite) or High-grade Metamorphic Rock (Gneiss)

Limestone

Calcium Carbonate (CaCO3)

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Quartz Vein Outcrop

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Clastic Sedimentary Rock (SiO2 with Fe2O3/FeOOH cement)

Blue Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Sandstone (with Iron Oxide)

Arenite with Limonite/Hematite staining

Sandstone (likely Arkosic)

Clastic Sedimentary Rock (Sandstone)

Quartzite

Quartzite (primarily SiO2)

Sunstone

Oligoclase (Plagioclase Feldspar Group) - (Ca, Na)(Al, Si)4O8

Amethyst

SiO2 (Silicon Dioxide) - Purple variety of Quartz

Sandstone

Arenite (Siliclastic sedimentary rock)

Red Sandstone (Iron-rich Sandstone)

Clastic Sedimentary Rock - Quartz Arenite / Arkose with Hematite Cement

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)