Synthetic Material (Not A Rock Or Mineral)

Sandstone (likely Arkose or Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Jadeite and Mixed Gemstones (Ruby, Sapphire, Emerald)

Jadeite (NaAlSi2O6), Corundum (Al2O3), Beryl (Be3Al2(Si6O18))

Sandstone

Arenite

Emerald

Beryl (Be3Al2(SiO3)6) with trace Chromium/Vanadium

Sandstone (likely River-tumbled Picture Sandstone)

Arenite (predominantly SiO2 with iron oxide impurities)

Sandstone

Arenite (SiO2 primarily)

Yellow Ochre / Limonite

Limonite (FeO(OH)·nH2O)

Acrylic or Resin (Synthetic Imitation)

Polymethyl Methacrylate (PMMA) or Polyepoxide

Sandstone (likely Quartzose Sandstone pebble)

Arenite (primarily SiO2)

Diamond (or high-quality simulant like Cubic Zirconia)

Carbon (C) - Native Element

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (with potential iron-oxide weathering)

Arenite (SiO2 based)

Chert

Silicon dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (SiO2 with iron oxide impurities)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt containing Zeolite or Quartz (SiO2/Silicates)

Sandstone (with Iron concretions/staining)

Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)

Quartz vein in Host Rock

Crystalline Silicon Dioxide (SiO2) in Lithic Matrix

Clear Quartz

Silicon Dioxide (SiO2)

Sandstone (Quartz-rich)

Arenite (composed mainly of SiO2)

Dalmation Stone (Dalmation Jasper)

Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)

Textile (Upholstery Fabric)

Woven Polyethylene/Polyester or Cotton Blend

Sandstone

Arenite (SiO2 primarily)

Sandstone

Arenite

Sandstone

Arenite (SiO2 primarily)

Ruby (Corundum)

Corundum (Aluminum Oxide) with chromium trace elements, Al2O3

Ruby

Corundum (Aluminium Oxide with Chromium impurities, Al2O3:Cr)

Sandstone (with Lichen)

Arenite (composed primarily of SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Calcareous Sandstone)

Calcareous Sandstone (primarily SiO2 with CaCO3 cement)

Sandstone (Glacial Cobble)

Arenite / Sedimentary Rock (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Sandstone (Quartz Arenite)

Sandstone (dominated by SiO2 quartz grains)

Sandstone (Ferruginous)

Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)

Crushed Stone (Gravel/Aggregates)

Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)

Sandstone (Ferruginous)

Sandstone (primarily SiO2 with Iron Oxide cement)

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2)

Milky Quartz (among River Rock)

Quartz (Silicon Dioxide, SiO2)

Staurolite (Cross Stone)

Staurolite (Fe2+2Al9Si4O23(OH))

Quartz Geode

Silicon Dioxide (SiO2) in Host Rock