Man Made Glass

Milky Quartz Pebble with Matrix

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based)

Quartzite with Milky Quartz Vein

Metamorphosed Quartz-rich Rock (SiO2)

Sandstone Pebble

Sandstone (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

Sandstone

Arenite (SiO2 primarily)

Sandstone

Arenite (SiO2 principal)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (SiO2 principal)

Sandstone (likely Quartzose)

Arenite (SiO2 principal mineral)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Coarse Sand or Fine Gravel

Detrital Sedimentary Fragments (mostly SiO2)

Sandstone

Sandstone (Sedimentary rock composed of silicate grains)

Sandstone

Arenite

Sandstone

Arenite (SiO2 based)

Sandstone (Quartzite-rich Pebble)

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 cement)

Pink Tumbled Agate

Silicon Dioxide (SiO2) with dye

Malachite

Malachite (Cu2CO3(OH)2)

Limestone

Calcium Carbonate (CaCO3)

Limestone (with potential fossil inclusions)

Calcium Carbonate (CaCO3)

Granite

Phaneritic Plutonic Felsic Rock (SiO2 > 69%)

Limestone (Grey and White specimens)

Calcium Carbonate (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite river stone

Quartzite (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky or Druzy Quartz)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Yellow Quartz

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite

Milky Quartz

Silicon Dioxide (SiO2)