Mineral (Man Made Glass)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Milky/Tan)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Likely weathered quartz or quartz-rich pebble

Quartz, silicon dioxide (SiO₂)

Quartz Geode

Silicon dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 dominated sandstone)

Sandstone

Clastic sedimentary rock (primarily quartz arenite)

Sandstone

Arenite

Sandstone

Arenite (SiO2 primarily)

Green Jasper

Microcrystalline Quartz (SiO2)

Amethyst and Smoky Quartz (Tumbled)

Silicon Dioxide (SiO2) with trace impurities iron (Amethyst) and aluminum/radiation (Smoky Quartz)

Quartz with Iron Staining

Silicon Dioxide (SiO2)

Sandstone

Arenite

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

White Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Sandstone

Arenite (Sandstone)

Sandstone

Arenite (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Tumbled blue-gray chalcedony (likely blue agate)

Chalcedony, microcrystalline quartz (SiO₂)

Blue Topaz

Al2SiO4(F,OH)2

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Quartz

Silicon Dioxide (SiO2)

Lepidolite

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

Milky Quartz with Inclusions

Silicon Dioxide (SiO2) with mineral inclusions

Milky Quartz

Silicon Dioxide (SiO2)

Copper and Quartz beads

Native Copper (Cu) and Crystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Grey Quartz (likely Smoky Quartz or Milky Quartz)

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Sandstone

Arenite

Smoky Quartz

Silicon Dioxide (SiO2) with natural radiation treatment

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz (Smoky/Grey Quartz Variant)

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)