Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock)
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Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite (Lithic Artifact)
Quartzite (SiO2)
metamorphic
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Blue slag-like mineral specimen, possibly bornite or chalcopyrite
Tentatively bornite (Cu5FeS4) or iridescent chalcopyrite (CuFeS2)
mineral
Chert Arrowhead (Projectile Point)
Microcrystalline Quartz (Chert or Flint)
sedimentary
Chert (Arrowhead/Projectile Point)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Arrowhead/Projectile Point)
Cryptocrystalline Quartz (SiO2)
sedimentary
Likely iron-rich slag or weathered ironstone
Hematite–goethite-rich material (Fe₂O₃/FeO(OH)); possibly industrial iron slag
mineral
Likely iron-rich rock or weathered metallic mineral fragment
Uncertain; possibly limonite/goethite or iron-bearing slag
mineral
Iron-rich slag or ironstone; appearance is not diagnostic
Likely iron-oxide-rich material (hematite, Fe₂O₃, and/or magnetite, Fe₃O₄); possibly smelting slag
mineral
Milky Quartz or Calcite Pebble
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
mineral
Titanium Aura Quartz (Bismuth-coated Druzy)
Silicon Dioxide (SiO2) with Titanium/Metal vapor coating
mineral
Sulfur
Native Sulfur (S)
mineral
Sulfur (with Matrix)
Native Sulfur (S8)
mineral
Bismuth Crystal
Bismuth (Bi)
mineral
Chert (Arrowhead Debitage or Flake)
Microcrystalline silica (SiO2)
sedimentary
Silver Nuggets (Natural or Cast)
Native Silver (Ag)
mineral
Arsenopyrite with Schist Matrix
Arsenopyrite (FeAsS)
mineral
Fluorite (Fluor-spar)
Calcium Fluoride (CaF2)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Tiffany Stone
Fluoritized Opal Beryllium Tuff (composed of Fluorite; CaF2, Opalized SiO2, Bertrandite, Chalcedony, and Quartz)
metamorphic
Fluorite (Purple/Blue variety)
Calcium Fluoride (CaF2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chalcopyrite
Chalcopyrite (CuFeS2)
mineral
N/A (Non-Geological Object)
N/A
Weathered Sedimentary Rock
Sedimentary Rock
Sedimentary
Silver (Sterling Silver Jewelry)
Argentum (Ag) mixed with Copper (Cu)
mineral
Iron-stained weathered rock
Unknown
Unknown (likely sedimentary or metamorphic)
Serpentine
Mg3Si2O5(OH)4
metamorphic
Gravel or Crushed Stone
Fragmented Aggregate Stone
sedimentary or igneous fragment
Asphalt fragment
Bituminous concrete
anthropogenic material
Silver (Jewelry form)
Native Silver (Ag)
mineral
Generic Rock Sample
Undetermined geological specimen
igneous
Chert Arrowhead
Cryptocrystalline microcrystalline Quartz (SiO2)
sedimentary
Quartzite Arrowhead (Archaeological Lithic)
Recrystallized Quartz (SiO2)
metamorphic
Calcite
Calcium Carbonate (CaCO3)
mineral
Possible meteorite fragment
Undetermined; likely an iron-rich meteorite or meteorite-like slag fragment
meteorite
Asphalt (Road Aggregate)
Asphalt concrete / Bituminous mixture
anthropogenic sedimentary (technolith)
Pyrite (on Quartz matrix)
Iron Disulfide (FeS2)
mineral
Likely beach-worn pebbles
Lithified rock fragments; exact rock type cannot be determined from the photo
sedimentary
Mother of Pearl (Nacre)
Aragonite (CaCO3) with Organic Matrix
mineral