Sedimentary Or Metamorphic (Base Substrate)

Sandstone (Ferruginous)

Arenite (SiO2 with Iron Oxide impurities)

Sandstone (with potentially high Feldspar/Arkose content)

Clastic sedimentary rock (SiO2 dominated)

Ironstone (with possible Hematite/Limonite coating)

Ironstone (Fe-rich sedimentary rock)

Graywacke with Quartz Vein

Lithic Sandstone (Graywacke)

Coquina or Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Coquina

Biogenic Limestone (Calcite/Aragonite)

Quartz Geode

Quartz (Silicon Dioxide, SiO2) Geode

Aura Quartz Geodes (Lab-Altered)

Silicon Dioxide (SiO2) with Metallic Vapor Deposition

Granitoid (Granite/Gneiss)

Granitoid silicate rock, primarily quartz and feldspar

Pyrite

Iron Sulfide (FeS2)

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Anthracite Coal

Anthracite (Carbon-based metamorphic rock, 86-97% C)

Chert (Iron-stained)

Chert (Cryptocrystalline Silica, SiO2)

Dalmatian Jasper

Dalmatian Stone (comprised of Feldspar, Quartz, and Arfvedsonite)

Limestone

Sedimentary Calcium Carbonate (CaCO3)

River Stone / Siltstone

Siltstone (composed of lithified silt)

Sandstone

Arenite (primarily SiO2)

Chert

Microcrystalline silica (SiO2)

Serpentine

Serpentine (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Sandstone (likely with Borings or Vesicular Basalt)

Clastic Sedimentary Rock (Sandstone)

Limestone (with Iron-Oxide staining)

Sedimentary Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Ruby

Corundum (Al2O3 with Chromium trace impurities)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Pyrite Concretion (Grapestone)

Iron Sulfide (FeS2) Concretion

Polygenetic Conglomerate (Puddingstone)

Conglomerate (SiO2 matrix with mixed clasts)

Schist

Mica Schist (primarily composed of quartz, feldspar, and mica)

Sandstone (likely Siltstone)

Arenite or Siltstone (high SiO2 content)

Magnetite

Magnetite (Fe3O4)

Quartzite

Quartzite (SiO2)

Siltstone

Siltstone (primarily SiO2 with Al2O3)

Anthracite Coal

Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)

Sandstone

Arenite (primarily SiO2)

Limestone

CaCO3 (Mainly Calcite or Aragonite)

Travertine

Terrestrial Sedimentary Limestone (CaCO3)

Conglomerate

Conglomerate (a clastic sedimentary rock)

Jasper (likely Brecciated or Multi-colored)

Jasper (SiO2)

Almandine Garnet in Schist

Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Ruby in Fuchsite

Corundum (Al2O3) in Fuchsite (K(Al,Cr)3Si3O10(OH)2)

Sandstone (with banding)

Arenite (primarily SiO2)