Sedimentary Rock (Technically Chert, A Microcrystalline Quartz)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

African Turquoise (Jasper)

Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)

Chert (variations include Flint or Jasper)

Silicon Dioxide (SiO2)

Chert (Red/Pink Jasper subtype)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Greenstone / Serpentinite

Serpentinite (composed primarily of minerals from the serpentine group Mg3Si2O5(OH)4)

Chert (specifically Red Chert / Flint)

Silicon Dioxide (SiO2)

Sandstone (Red/Brown Variety)

Arenite (SiO2 with iron oxide impurities)

Ferruginous Sandstone

Sandstone, Iron-rich

Dragon Blood Jasper (also known as Dragon Stone)

Epidotized septarian concretion or Jasper/Epidote breach (typically a combination of Epidote and Pietersite or Red Jasper)

Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate (Detrital Sedimentary Rock)

Travertine

Terrestrial Sedimentary Rock (CaCO3)

Crushed Limestone

Sedimentary Carbonate Rock (CaCO3)

Dendritic Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Agate

Agate (Cryptocrystalline Variety of Quartz, SiO2)

Piddock bored rock (likely Mudstone or Shale)

Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock

Quartzite

Quartzite (SiO2)

Limestone (Fossiliferous)

Calcium Carbonate (CaCO3) - Bioclastic Limestone

Conglomerate

Conglomerate (clastic sedimentary rock)

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone

Arenite (SiO2 based typically)

Quartz Geode (with possible Manganese or Goethite coating)

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate (Clastic sedimentary rock)

Limonite (after Pyrite Pseudomorph)

Limonite (Hydrated Iron Oxide Mixture, FeO(OH)·nH2O)

Crushed Limestone

Calcium Carbonate (CaCO3)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Druzy Quartz)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite with Iron oxide staining (SiO2 with Fe2O3)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Dragon Stone

Argillaceous Sedimentary Rock (Ohko Stone)

Anthracite Coal

Anthracite (Carbon-rich Sedimentary Rock)

Milky Quartz

Silicon Dioxide (SiO2)

Conglomerate

Clastic sedimentary rock (Conglomerate)

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone

Clastic sedimentary rock (Quartz arenite/Arkose)

Sandstone

Arenite (composed primarily of Quartz, SiO2)

Botryoidal Chalcedony (likely Chert or Agatized Coral)

Silicon Dioxide (SiO2)