Sedimentary Or Metamorphic (Base Substrate)

Sandstone

Arenite (primarily Quartz SiO2)

Fossiliferous Limestone

Biogenic Calcium Carbonate (CaCO3)

Biotite-rich mica schist

Mica schist, dominated by biotite mica (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂), with probable quartz and feldspar

Red Mudstone (Siltstone)

Lutite (primarily Quartz and Clay minerals with Hematite)

Black Jasper

Silicon dioxide (SiO2) with carbonaceous impurities

Banded Chert / Jasper

Silicon Dioxide (SiO2)

Amber

Succinates (Organic Gemstone)

Coal (Anthracite or Bituminous)

Carbo caulis / Sedimentary Carbon

Precious Opal

Hydrated amorphous silica (SiO2·nH2O)

Gneiss with Quartz Vein

Metamorphic Gneiss with Quartz (SiO2) and Feldspar Injection

Muscovite Mica (in Quartz/Feldspar Matrix)

Muscovite - KAl2(AlSi3O10)(OH)2

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (likely Graywacke or Arkose)

Clastic Sedimentary Rock (primarily SiO2 with various lithic fragments)

Limestone

Calcium Carbonate (CaCO3)

Crushed Limestone

Calcite-rich Sedimentary Rock (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

Dendritic Jasper

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Garnet in Matrix

Almandine or Spessartine Garnet in Quartz/Schist Matrix (X3Al2(SiO4)3)

Soapstone

Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Micaceous)

Arenite (composed primarily of SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3/FeO(OH) cementing agents)

Sandstone

Arenite (primarily Quartz-based Sandstone)

Asphalt / Bituminous Aggregate

Bituminous mixture (Hydrocarbon-based sediment)

Sandstone with Iron Staining

Arenite (SiO2 based with Fe2O3 staining)

Sandstone

Arenite (SiO2 based clastic rock)

Sandstone (Red Sandstone)

Arenite (SiO2 based with Fe2O3 staining)

Garnet Schist

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

Agate

Agate (a cryptocrystalline variety of Quartz, SiO₂)

Fuchsite

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Conglomerate

Clastic sedimentary rock (Puddingstone)

Conglomerate

Conglomerate (clastic sedimentary rock)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with impurities

Sandstone (Quartzose Pebble)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Glacial Cobble)

Arenite / Sedimentary Rock (primarily SiO2)

Chert (or Limestone)

Sedimentary Cryptocrystalline Quartz (SiO2) or Calcium Carbonate (CaCO3)

Coquina / Limonite-stained Limestone

Sedimentary Limestone with Iron Oxyhydroxide (FeO(OH)·nH2O)

Grey Chalcedony (Tumbled)

Chalcedony (SiO2)