Igneous Or Sedimentary (Anthropogenic Modification)

Painted Garden Rock (likely Granite or Limestone base)

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments

Chert (Arrowhead Preform or Point)

Chert (Microcrystalline Quartz, SiO2)

Nutting Stone / Cupstone (Sandstone or Quartzite)

Sedimentary rock with anthropogenic modification (cupule)

Chert (specifically a Lithic Flake)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (Arrowhead or Flake)

Microcrystalline quartz (SiO2)

Basalt

Basalt (Mafic volcanic rock)

Grooved Maun Ball (Maul/Hammerstone-like Concretion)

Calcareous/Ferruginous Concretion in Sandstone Matrix

Red Painted Rock

Artificial Coated Lithic Fragment

Basalt Metate

Vesicular Basalt

Dolomite (Dolostone)

Dolomite [CaMg(CO3)2]

Quartz Arrowhead

Silicon Dioxide (SiO2)

Painted Sandstone

Sandstone (clastic sedimentary rock) with acrylic/artistic coating

Chert (Arrowhead Fragment)

Chert / Microcrystalline Silicon Dioxide (SiO2)

Concrete

Anthropogenic Conglomerate

Asphalt concrete

Anthropogenic conglomerate

Concrete rubble

Anthropogenic conglomerate

Painted River Rock

Polished fluvial clast with acrylic/synthetic pigment coating

Pitted Sedimentary Rock / Cupstone

Sedimentary rock with weathering pit (arenite / sandstone)

Painted Pet Rock (Quartzite/Sandstone base)

Silicon Dioxide (SiO2) with anthropomorphic acrylic embellishments

Smelter Slag

Anthropogenic Silicate Slag

Fire Agate (Crackle Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (Flint) Artifact

Silicon Dioxide (SiO2)

Slag

Anthropogenic silicate slag

Slag (Industrial Glass/Glassy Rock)

Anthropogenic Vitreous Material

Ferrocoke or Slag

Anthropogenic pyrometallurgical residue

Chert (specifically Flint or Gray Chert)

Silicon Dioxide (SiO2)

Flint or chert

Microcrystalline quartz (SiO₂), commonly called flint when dark and nodular

Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Fordite

Anthropogenic paint-rock

Glauconitic Sandstone

Glauconitic Sandstone (complex silicate formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Chert or heavily weathered flint

Microcrystalline quartz (SiO₂), likely chert/flint

Slag

Anthropogenic silicate slag

Slag

Anthropogenic silicate slag

Industrial Slag

Anthropogenic Vitreous Slag

Iron Slag

Anthropogenic pyrometallurgical byproduct

Asphalt Concrete (Bituminous Conglomerate)

Anthropogenic Bituminous Conglomerate

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert Arrowhead (Projectile Point)

Microcrystalline Quartz (Chert/Flint)

Flint Arrowhead

Cryptocrystalline quartz (Chert/Flint, SiO2)

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Aggregate Concrete

Anthropogenic Conglomerate (Technosol)

Chert / Flint Handaxe

Cryptocrystalline Quartz (SiO2)