Sedimentary (Primary) With Artificial Modification

Dyed and Metallic Coated Agate Geode

Silicon Dioxide (SiO2) with titanium/gold vapor deposition coating

Red Painted Rock

Artificial Coated Lithic Fragment

Painted Sandstone

Sandstone (clastic sedimentary rock) with acrylic/artistic coating

Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Chert (specifically Flint or Gray Chert)

Silicon Dioxide (SiO2)

Flint Arrowhead

Cryptocrystalline quartz (Chert/Flint, SiO2)

Concrete Fragment

Artificial Conglomerate (Cement and Aggregate)

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

Aggregate Concrete

Anthropogenic Conglomerate (Technosol)

Concrete with Aggregate

Artificial Conglomerate (Cement and Aggregate)

Chert (Arrowhead Preform or Point)

Chert (Microcrystalline Quartz, SiO2)

Painted Garden Rock (likely Granite or Limestone base)

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

Asphalt (Bituminous pavement fragment)

Artificial conglomerate / Bitumen-Aggregate mixture

Asphalt (Bituminous Rock)

Natural bitumen or Bituminous limestone/sandstone

Moqui Marble (Shaman Stone)

Iron Oxide Concretion (Hematite/Goethite shell with Sandstone core)

Dolomite (Dolostone)

Dolomite [CaMg(CO3)2]

Chert (specifically a Lithic Flake)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Tumbled Quartz

Silicon Dioxide (SiO2)

Dyed Chalcedony (Agate)

Silicon Dioxide (SiO2) with artificial pigment

Painted River Rock

Polished fluvial clast with acrylic/synthetic pigment coating

Chert (Arrowhead Fragment)

Chert / Microcrystalline Silicon Dioxide (SiO2)

Pitted Sedimentary Rock / Cupstone

Sedimentary rock with weathering pit (arenite / sandstone)

Dyed Chalcedony (Agate)

Silicon Dioxide (SiO2) with artificial pigment

Nutting Stone / Cupstone (Sandstone or Quartzite)

Sedimentary rock with anthropogenic modification (cupule)

Fire Agate (Crackle Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Concrete

Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)

Chert (Arrowhead or Flake)

Microcrystalline quartz (SiO2)

Painted Pet Rock (Quartzite/Sandstone base)

Silicon Dioxide (SiO2) with anthropomorphic acrylic embellishments

Chert (Flint) Artifact

Silicon Dioxide (SiO2)

Chert or heavily weathered flint

Microcrystalline quartz (SiO₂), likely chert/flint

Chert Arrowhead (Projectile Point)

Microcrystalline Quartz (Chert/Flint)

Flint or chert

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Turquoise (Dyed Howlite/Magnesite imitation)

CuAl6(PO4)4(OH)8·4H2O (Target mineral) / Ca2B5SiO9(OH)5 (Actual specimen: Howlite)

Glauconitic Sandstone

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

Asphalt Concrete

Bituminous Concrete

Concrete or artificial stone core sample

Artificial conglomerate

Diamond (or Diamond Simulant/Cubic Zirconia)

Carbon (C) - if diamond, or Zirconium dioxide (ZrO2) - if Cubic Zirconia

Chert (Arrowhead Debitage or Spall)

Silicon Dioxide (SiO₂)

Basalt Metate

Vesicular Basalt

Dyed Agate

Chalcedony (SiO2 with impurities)

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)