Sedimentary (Cryptocrystalline Quartz)

Sandstone

Arenite (SiO2 primarily)

Ferruginous Sandstone (Gerrit)

Arenite with Iron Oxide cementation

Chert / River Pebble

Silicon Dioxide (SiO2)

Sandstone (Quartzite Pebble)

Arenite (primarily SiO2)

Turquoise

Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O

Sandstone

Clastic sedimentary rock (primarily SiO2)

Milky Quartz (Ferruginous variety)

Silicon Dioxide (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (likely Calcareous or Quartz-rich)

Arenite (SiO2 based typically)

Sandstone

Arenite (Sedimentary rock composed of sand-sized minerals or rock grains)

Quartz (Clear/White)

Silicon Dioxide (SiO2)

Quartz (Milky/Crystalline)

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Granite Sand (Decomposed Granite)

Grus / Quartz-Feldspar Detritus

Jasper

Silicon dioxide (SiO2)

Wishing Stone (Quartz-veined Siltstone or Graywacke)

Hydrothermal Quartz vein in matrix of SiO2 (Quartz) and Al2O3 (Clay minerals)

Clear Quartz

Silicon Dioxide (SiO2)

Jasper (Yellow Jasper)

Silicon Dioxide (SiO2) with iron inclusions

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Agate and Amethyst (Quartz variants)

Silicon Dioxide (SiO2) - Microcrystalline Quartz and Crystalline Quartz

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Druzy Quartz Geode (Oco or Moroccan variety)

Silicon Dioxide (SiO2)

Green Aventurine

Silicon Dioxide (Quartz) with inclusions of Fuchsite mica (K(Al,Cr)2(AlSi3O10)(OH)2)

Gold Nugget

Native Gold (Au)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Amethyst

Amethyst (Silicon Dioxide - SiO2 with iron impurities)

Sandstone

Arenite (composed primarily of Quartz, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Greywacke)

Clastic Sedimentary Rock (SiO2 with lithic fragments)

Granitic Sand

Detrital sediment (predominantly Quartz, Feldspar, and Mica)

Gneiss

Gneiss

Sandstone with Ironstone Banding

Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)

Conglomerate

Clastic Sedimentary (Conglomerate)

Chert (variations include Flint)

Chert (SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Zebra Jasper (Zebra Stone)

Tumbled Silicon Dioxide (SiO2) with impurities

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz and/or feldspar)

Chert / Flint Nodules in Sandstone

Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Fe2O3 staining)

Sandstone Pebble with Iron Staining

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)