Synthetic Material (Not A Rock Or Mineral)

Sandstone (with Moss)

Quartz Arenite / Sandstone

Sandstone (Wonderstone)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone

Sandstone (Quartz-rich Arenite / SiO2)

Ruby (varieties of Corundum)

Aluminum oxide (Al2O3) with Chromium traces

Quartz Pebble

Silicon Dioxide (SiO2)

Ruby

Corundum (Al2O3 with Chromium traces)

Agate (Polished Sphere)

Silicon Dioxide (SiO2)

Quartz Vein in Siltstone

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

Sandstone

Sedimentary Rock (Quartz Sandstone)

Gravel and Sand Aggregate

Unconsolidated Clastic Sediment

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Ruby (in jewelry)

Corundum (Al2O3 with Chromium traces)

Sandstone

Sedimentary Rock (Quartz arenite)

Milky quartz with dark host-rock inclusions

Quartz (SiO₂), likely in a granitic or metamorphic matrix

Sandstone

Clastic sedimentary rock

Strawberry Quartz

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Opalite

Man-made opalized glass

Cobaltoan Calcite / Pink Dolomite (Possible)

Cobaltoan Calcite: (Ca,Co)CO3; Pink Dolomite (or Thulite): CaMg(CO3)2 or Mn-Dolomite / (Thulite: Mn2+3Al2(Si2O7)(SiO4)O(OH))

Thunderegg (Agate or Quartz Geode)

Silica-filled rhyolitic nodule (SiO2)

Sandstone

Sandstone (Sedimentary rock composed of silicate grains)

Sandstone

Arenite

K2 Stone (or K2 Jasper)

Azurite-in-Granite (Potassium Feldspar, Quartz, Plagioclase, Muscovite, and Azurite)

Emerald

Beryl (Be₃Al₂(SiO₃)‑₆) with Chromium/Vanadium impurities

Colorless faceted gemstone, likely cubic zirconia

Cubic zirconia (synthetic ZrO₂), possibly glass or white sapphire

Sandstone

Arenite (primarily Quartz, SiO2)

Decorative polished pebbles

Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Sandstone

Arenite (SiO2 based with mineral cement)

Sandstone with Dendritic Inclusions

Quartzose Sandstone

Sandstone (Weathered Pebble)

Sedimentary Rock (Quartz arenite)

Sandstone

Sedimentary Clastic Rock

Fossil Snail

Gastropoda (fossilized)

Ruby

Corundum (Al2O3 with Chromium impurities)

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Smoky Quartz

Silicon Dioxide (SiO2)

Ruby

Corundum (Al2O3 with Chromium traces)

Blue Topaz

Topaz [Al2SiO4(F,OH)2]

Amethyst (Tumbled/Weathered Quartz)

Amethyst (SiO2 with iron impurities)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)