Sedimentary Rock (Cryptocrystalline Quartz)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Sandstone (likely with Quartz Veining)

Arenite (primarily SiO2)

Wood Jasper

Siliceous sedimentary rock (variety of Chert/Chalcedony)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Thunderegg (Ate Agate/Jasper Geode)

Silicon Dioxide (SiO2) within Rhyolite/Perlite matrix

Kambaba Jasper (Crocodile Jasper)

Rhyolite containing Fossilized Cyanobacteria (Stromatolite)

Geode (Quartz)

Silicon Dioxide (SiO2)

Shale (possibly Carbonaceous or Oil Shale)

Laminated Mudstone (primarily clay minerals and quartz)

Shale

Shale (comprised mostly of clay minerals and quartz)

Greywacke (likely)

Greywacke (a type of sandstone)

Heliotrope (Bloodstone)

Cryptocrystalline Quartz (SiO2) with inclusions of Hematite (Fe2O3)

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Sandstone concretion (Ironstone-stained)

Arenite with Limonite/Hematite staining (Silica-based with Iron Oxides)

Conglomerate

Clastic sedimentary rock (Conglomerate)

Jasper (specifically Yellow and Red Jasper/Chert)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Quartz Geode

Silicon Dioxide (SiO2) within a secondary sedimentary structure

Quartz Crystal

Quartz (SiO₂)

Sandstone

Arenite (primarily Quartz Arenite)

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone

Arenite

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Quartzite Pebble (River Rock)

Quartzite (mainly SiO2)

Red Jasper (Quartz)

Silicon Dioxide (SiO2) with Iron impurities

Red Quartz (Druzy)

Silicon Dioxide (SiO2) with Hematite inclusions

Quartz Geode (Druzy Quartz)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (Fe-bearing Clastic Sedimentary Rock)

Sandstone

Arenite (primarily SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Geode (Unopened)

Siliceous Concretion / Geode

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Sandstone (Yellow/Tan)

Clastic sedimentary rock (primarily SiO2 with iron oxide staining)

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Limestone with Quartz or Calcite Veining

Calcium Carbonate (CaCO3) matrix with SiO2 or CaCO3 inclusions

Carnelian

Carnelian (Microcrystalline Quartz, SiO2)

Green Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Quartz / Rock Crystal

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (Ferruginous)

Arenite (with high iron oxide content)

Chalcedony

Silicon dioxide (SiO2) - Microcrystalline quartz

Petrified Wood

Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)