Man Made Glass

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Sandstone (with Lichen)

Arenite (composed primarily of SiO2)

Quartzite pebble

Quartzite (primarily SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (with Concretion)

Arenite / Quartzose Sandstone

Sandstone

Arenite (SiO2 based)

Sandstone (Weathered Cobble)

Clastic sedimentary rock (primarily SiO2)

Quartzite Pebble

Metamorphic Quartz (SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (SiO2 based)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Coarse Sandstone

Arenite (SiO2 based)

Quartz (Quarzite or Massive Quartz vein)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Sandstone (Ferruginous)

Sandstone (primarily SiO2 with Iron Oxide cement)

Clear Quartz

Silicon Dioxide (SiO2)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (Red Sandstone / River Stone)

Arenite (composed primarily of Quartz, SiO2, with Iron Oxide cementation)

Sandstone (with potential iron-oxide staining)

Arenite (primarily SiO2)

Milky Quartz

Silicon dioxide (SiO2)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Quartz-rich)

Arenite (SiO2 based)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Sandstone (likely Calcareous or Micaceous)

Clastic sedimentary rock (primarily Quartz with Cementing Agents)

Sandstone (likely Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone (Quartz-rich)

Arenite (composed mainly of SiO2)

Sandstone

Arenite (primarily SiO2)

Chert (Flint nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz