Sedimentary (Jasper), Mineral (Aquamarine)

Sandstone Pebble

Arenite (primarily SiO2)

Lapis Lazuli

Complex mixture containing Lazurite ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2), Calcite, and Pyrite

Sandstone

Arenite (SiO2 based with mineral cement)

Conglomerate

Conglomerate (Sedimentary rock)

Sandstone (Micaceous)

Arenite (primarily SiO2 with Phyllosilicates)

Sandstone Concretion

Clastic sedimentary rock (primarily Silica, SiO2, or Calcium Carbonate, CaCO3)

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)

Quartz (Drusy/Crystalline)

Silicon Dioxide (SiO2)

Sandstone (Red Sandstone / River Stone)

Arenite (composed primarily of Quartz, SiO2, with Iron Oxide cementation)

Bauxite

Bauxite (Al2O3·nH2O)

Bauxite

Bauxite (Al2O3·nH2O)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Sandstone (Red Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide)

Sandstone (Beach Pebble)

Clastic sedimentary rock (primarily Quartz and Feldspar)

Sandstone (Graywacke)

Clastic Sedimentary Rock (Lithic Sandstone)

Limonitic Sandstone with Inclusion

Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)

Sandstone

Arenite (primarily SiO2)

Cinnabar

Mercury(II) sulfide (HgS)

Sandstone

Arenite (SiO2 based)

Sandstone (Ferruginous)

Sandstone (primarily SiO2 with Fe2O3 cement)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2 with various cementing agents)

Red Sandstone

Arenite (primarily Quartz with Iron Oxide)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Geode with Iron-Stained Quartz/Calcite

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix

Sandstone (Ferruginous)

Arenite (with Iron Oxides)

Green Fluorite

Calcium Fluoride (CaF2)

Glauconite

(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2

Sandstone

Arenite (primarily SiO2)

Rhodochrosite

Manganese carbonate (MnCO3)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Red Siltstone (or Red Shale)

Clastic Sedimentary Rock (Composition: primarily Quartz, Clay minerals, and Hematite Fe2O3)

Pyrite

Iron Pyrite (FeS2)

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)

Quartz

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 cementation)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Sandstone

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Arenite (Fe-rich)