Sedimentary Rock

Chert (White/Gray variety)

Chert (SiO2)

Asphalt (Bituminous Pavement)

Bituminous mix (Aggregates with Bitumen binder)

Oolitic Chert

Ooidal Microcrystalline Quartz (SiO2)

Red Jasper with Quartz veins

Jasper (Silicon Dioxide, SiO2) with macrocrystalline Quartz veins

Sandstone

Arenite (primarily SiO2, silica)

Gneiss

Gneiss (high-grade metamorphic rock typically composed of quartz, feldspar, and mica)

Biotite Schist

Biotite Schist

Blue Lace Agate

Cryptocrystalline Quartz (SiO2) with trace minerals

Marble

Recrystallized Calcite Rock (CaCO3)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limestone

CaCO3 (principally composed of Calcite)

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

Quartz Vein in Host Rock (clastic sediment)

Silicon Dioxide (SiO2) in matrix

Gneiss (High-grade Metamorphic Rock)

Gneiss (Metamorphic silicate rock)

Sandstone (specifically Arkose or Ferruginous Sandstone)

Sandstone (SiO2 with iron oxide inclusions)

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)

Sandstone with trace fossil

Sandstone, possibly with Skolithos or similar trace fossil

Gneiss

Gneiss

Oolitic Chert

Silicon Dioxide (SiO2) with Oolitic texture

Chert (Jasper type)

Microcrystalline Quartz (SiO2)

Specular Hematite

Hematite (Fe2O3)

Turquoise (set in silver jewelry)

Turquoise - CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Chert (Yellow/Tan)

Microcrystalline Quartz (SiO2)

Bauxite (Pisolitic Bauxite)

Bauxite (mixture of Hydrous Aluminum Oxides)

Oolite (Ooids)

Oolitic Limestone (Principal mineral: Calcite, CaCO3)

Chert (Jasper/Mudstone)

Silicon Dioxide (SiO2)

Chert (Nodular Chert)

Silicon Dioxide (SiO2)

Chert (variations include Flint or Jasper)

Silicon Dioxide (SiO2)

Coquina

Bioclastic Limestone (Calcium Carbonate, CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Coarse Sand Grain / Lithic Fragment

Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)

Ruby in Kyanite

Al2O3 (Corundum) in Al2SiO5 (Kyanite-Fuchsite-Quartz)

Fossiliferous Limestone with Brachiopod Mold

Calcium Carbonate (CaCO3) matrix containing Brachiopoda fossil impressions

Coquina / Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate - CaCO3)

Chert (Brown variety)

Silicon Dioxide (SiO2)

Jasper (Iron-stained Quartz)

Silicon Dioxide (SiO2) with iron oxide inclusions

Petrified Wood

Silicified Wood (SiO2)

Ferruginous Sandstone (Ironstone)

Ferruginous Sandstone / Limonite-cemented Quartz Sandstone

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)