Sedimentary (Man Made)

Quartz Pebble

Silicon Dioxide (SiO2)

Jasper Pendant

Chalcedony (Quartz) - SiO2

Drupa or Druzy Quartz on Geode Fragment

Crystalline Silicon Dioxide (SiO2)

Chalcedony (Botryoidal Agate)

Silicon Dioxide (SiO2)

Agate Bookend / Quartz Geode

Silicon Dioxide (SiO2)

Nutting Stone / Cupstone (Sandstone or Quartzite)

Sedimentary rock with anthropogenic modification (cupule)

Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

White Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Pale Rose or Milky Variety)

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 principal component)

Sandstone

Arenite (SiO2 based)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)

Sandstone

Sandstone (clastic sedimentary rock)

Sandstone (Quartzose)

Arenite (SiO2 based)

Rhodochrosite

Manganese Carbonate (MnCO3)

Rhodochrosite

Manganese Carbonate (MnCO3)

Rhodochrosite

Manganese carbonate (MnCO3)

Silty Shale

Silty Shale (Fissile Sedimentary Rock)

Sandstone

Arenite (SiO2 primarily)

Sandstone (likely Quartz Sandstone)

Arenite (composed primarily of SiO2)

Sandstone

Arenite

Sandstone

Arenite (SiO2 primarily)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Sandstone

Clastic Sedimentary Rock

Milky Quartz

SiO2 (Silicon Dioxide)

Orange Calcite

Calcium Carbonate (CaCO3)

Seashell Fossil

Gastropoda fossil

Sandstone

Clastic Sedimentary Rock

Shale and Pebble Fragment

Sedimentary Rock (Mudstone/Shale with Silica Pebble)

Sandstone

Sedimentary Rock (Quartz/Feldspar grains cemented together)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Bauxite

AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Snow)

Silicon Dioxide (SiO2)

Satin Spar (Gypsum)

Hydrous Calcium Sulfate (CaSO4·2H2O)

Sandstone

Arenite

Pyrite

Iron Sulfide (FeS2)