Likely metallic meteorite fragment
Undetermined; possibly an iron meteorite or stony-iron meteorite
meteorite
Category
Industrial Byproduct (Anthropogenic Rock)
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Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Sea Glass
Amorphous Silica (Anthropogenic glass) - SiO2
mineral
Grooved Maun Ball (Maul/Hammerstone-like Concretion)
Calcareous/Ferruginous Concretion in Sandstone Matrix
sedimentary
Chert (often called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Arrowhead Artifact)
Microcrystalline Quartz (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Concrete Fragment
Hardened Portland cement and mineral aggregate
sedimentary (anthropogenic)
Chalcanthite
Hydrated copper(II) sulfate (CuSO4·5H2O)
mineral
Gold
Native Gold (Au)
mineral
Iron-rich concretion or slag-like mineral fragment
Likely limonite/goethite (FeO(OH)·nH₂O), possibly magnetite-bearing material
mineral
Chert (Arrowhead or Flake)
Microcrystalline quartz (SiO2)
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Carborundum (Silicon Carbide)
Silicon carbide (SiC)
mineral
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Tiffany Stone
Bertrandite (with Fluorite, Opal, and Chalcedony), Be4Si2O7(OH)2
mineral
Chert (Yellow Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Arrowheads)
Microcrystalline Quartz (SiO2)
sedimentary
Sea Glass
Amorphous Silicon Dioxide (Man-made glass weathered by nature)
mineral
Sulfur
Native Sulfur (S)
mineral
Sulfur (with possible Cullet Glass or Slag imitation)
Native Sulfur (S8)
mineral
Red Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Note: Item is not a geological specimen
Polyester mesh and Ethylene-vinyl acetate (EVA) polymer
Synthetic / Anthropogenic Material
Chert (Arrowhead Fragment)
Silicon Dioxide (SiO2)
sedimentary
Sea Glass
Man-made silicate glass
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Arrowhead (Lithic Artifact)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Arrowhead (Projectile Point)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead/Tool variety)
Microcrystalline Quartz (SiO2)
sedimentary
Likely iron-rich slag or weathered ironstone fragment
Uncertain; possibly iron oxide–rich material (hematite/goethite) or industrial iron slag
mineral
Green Sea Glass
Man-made vitreous material (silica glass)
gemstone
Mystic Topaz
Aluminum silicate fluoride hydroxide with titanium coating (Al2SiO4(F,OH)2)
mineral
Green Quartz (Prasiolite or Aventurine)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Chert (SiO2)
sedimentary
Asphalt (Bituminous Concrete)
Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)
not a rock (anthropogenic material/technofossil)
Chert (specifically Flint Arrowhead)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Bismuth
Bismuth (element Bi) with oxidized thin-film interference layer
mineral