Man Made Material (Anthro Lithic Product)

Bull Quartz (White Quartz)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Fluorite (Rainbow, Purple-Blue Tumbled)

Calcium Fluoride (CaF2)

Fluorite

Calcium Fluoride (CaF2)

Synthetic Sapphire and Ion-X Glass

Single-crystal Alumina (Al2O3) and Ion-strengthened Aluminosilicate Glass

Milky Quartz (or Bull Quartz)

Silicon Dioxide (SiO2)

Diamond (or Diamond Simulant/Cubic Zirconia)

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

Coquina

Coquina (Bioclastic Limestone)

Quartzite

Quartzite (primarily SiO2)

Fossiliferous Limestone

CaCO3 (principally Calcite or Aragonite)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Phyllosilicate)

Polished Chert (Flint)

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Sandstone (with Lichen)

Arenite (composed primarily of SiO2)

Sandstone (likely Quartzose)

Sandstone (Principally SiO2)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Sandstone

Arenite (primarily SiO2)

Limestone

Calcium carbonate (CaCO3)

Sandstone (with Concretion)

Arenite / Quartzose Sandstone

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Fluorite

Calcium Fluoride (CaF2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (Quartz-rich)

Arenite (SiO2 based)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone (with potential iron-oxide staining)

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Sandstone (Ferruginous)

Sandstone (primarily SiO2 with Iron Oxide cement)

Sandstone

Arenite (primarily SiO2)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone (Quartz-rich)

Arenite (composed mainly of SiO2)

Sandstone (likely Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Clear Quartz crystals on a Matrix base (Geode fragment)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Sandstone (likely Arkose or Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Fossiliferous Limestone

Fossiliferous Calclutite / Bio-calcarenite (CaCO3)

Iron Ore / Ironstone Concretion

Mixture of iron oxide/hydroxide minerals, likely some combination of Hematite (Fe2O3), Goethite (α-FeOOH), and Limonite (a general term for hydrated iron oxides of variable composition) or potentially Bauxite (a mixture of aluminum hydroxides, often with iron oxides, (Al(OH)3) and FeO(OH)). The visual characteristics strongly suggest iron-rich material.