Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)

Sandstone Pebble with Iron Staining

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)

Sandstone

Arenite (primarily Quartz, SiO2)

Quartz (Druzy or Geode fragment)

Silicon Dioxide (SiO2)

Quartz Pebble (with Iron Inclusions)

Silicon Dioxide (SiO2)

Carnelian

Carnelian Chalcedony (SiO2 with iron oxide impurities)

Granite

Granite (Felsic Plutonic Rock)

Common Opal (Green Opal / Pistachio Opal)

Hydrated silica (SiO2·nH2O)

Quartz Geode (with Agate banding)

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chalcedony (Agate/Quartz)

Silicon Dioxide (SiO2)

Imperial Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz with Mineral Inclusions

Sandstone (likely Arkosic or Quartzose)

Sandstone (SiO2 with inclusions)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz (with Iron Oxide staining)

Silicon Dioxide (SiO2)

Sandstone (with potential Arkose/Lithic characteristics)

Arenite (Sedimentary rock composed of sand-sized grains)

Red Chalcedony (likely dyed)

Chalcedony (a variety of Quartz), SiO2

Concretion (Sandstone)

Carbonate-cemented Sandstone Concretion

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within a metamorphic matrix

Quartzite (Iron-stained)

Quartzite (SiO2 with Fe-oxides)

Granite

Granite (Felsic Plutonic Rock)

Banded Chert

Cryptocrystalline Quartz (SiO2)

Quartzite

Quartzite (SiO2)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Chert (Cherty Limestone / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Gneiss

Gneiss

Sandstone (likely Quartzose Sandstone)

Arenite (primarily SiO2)

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and clay impurities

Quartz

Quartz (Silicon Dioxide, SiO2)

Quartzite

Quartzite (SiO2)

Sandstone with Ironstone Banding

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

Sandstone (with Lichen)

Arenite (composed primarily of SiO2)

Greenstone with Quartz Veining

Epidiorite or Metabasalt with SiO2 (Quartz) veins

Quartzite with Hematite staining

Quartzite (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Ferruginous Siltstone or Mudstone

Ferruginous Siltstone / Goethitic Sandstone

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Chert (Flint Nodules)

Microcrystalline Quartz (SiO2)

Turquoise

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

Sandstone (likely Quartzose type)

Clastic sedimentary rock (primarily SiO2)

Chert (Jasper/Carnelian variety)

Microcrystalline Quartz (SiO2)

Sandstone (likely Ferruginous)

Sandstone (SiO2 with iron oxides)