Anthropogenic (Man Made Material Processed By Nature)

Obsidian Arrowhead

Volcanic Glass (Primary composition: SiO2)

Chert Arrowhead

Cryptocrystalline microcrystalline Quartz (SiO2)

Dyed Dragon Vein Agate

Silicon Dioxide (SiO2) with artificial pigment

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Chert (Arrowhead)

Microcrystalline Quartz (SiO2)

Rainbow Hematite (Man-made/Treated)

Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)

Possible tektite or iron-rich slag-like natural specimen

Uncertain; possibly natural glass (tektite) or magnetite-rich rock

Tumbled tiger’s eye

Tiger’s eye (chatoyant quartz), SiO₂, typically pseudomorphic quartz after crocidolite

Polished red jasper beads

Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly colored by iron oxides

Rounded metallic-looking pebble, likely iron-rich rock or slag

Uncertain; possible limonite/goethite-rich ironstone, hematite-bearing material, or industrial slag

Tumbled carnelian (likely)

Chalcedony, microcrystalline quartz (SiO₂), iron-oxide colored variety

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Asphalt (Bituminous Pavement Bit)

Bitumen-bound aggregate (Petrochemical-bound composite)

Opalite

Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)

Libyan Desert Glass

Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)

Orange Calcite

Calcium Carbonate (CaCO3)

Likely polished greenstone or serpentine inlay

Serpentine-group mineral, commonly antigorite/lizardite; possibly nephrite jade

Chert (Nodule)

Chert (Alpha-Quartz, SiO2)

Aura Quartz / Rainbow Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Chert (likely flint)

Microcrystalline quartz, SiO₂

Blue gemstone ring, likely blue topaz or synthetic blue spinel

Likely topaz (Al₂SiO₄(F,OH)₂) or synthetic spinel (MgAl₂O₄); identification is uncertain from the image

Quartzite pebble

Quartzite (SiO2)

Chert Arrowhead

Microcrystalline Quartz (SiO2)

Pyrite-rich sulfide ore (likely pyrite with chalcopyrite)

Pyrite, FeS₂; possible chalcopyrite, CuFeS₂, and minor quartz or sphalerite

Chert

Microcrystalline quartz (SiO2)

Tumbled blue gemstone, likely blue quartz or dyed chalcedony

Quartz (SiO₂), possibly chalcedony; exact identification requires testing

Diamond

Carbon (C)

Black tourmaline (schorl) on quartz matrix

Schorl, NaFe3Al6(BO3)3Si6O18(OH)4, commonly associated with quartz (SiO2)

White quartz bead strand (likely milky quartz)

Quartz, silicon dioxide (SiO₂), crystalline silica

Diamond ring

Diamond (crystalline carbon, C)

Asphalt Pavement (with aggregate)

Asphalt concrete

White Marble

Recrystallized Calcite (CaCO3)

Green Slag Glass

Cullet (Amorphous Silicon Dioxide with impurities)

Polished blue stone, likely sodalite or dyed quartz

Possibly sodalite (Na₈Al₆Si₆O₂₄Cl₂) or artificially dyed quartz/chalcedony; image alone is inconclusive

Polished gray-brown stone slab, possibly soapstone or schist

Indeterminate; likely talc-rich soapstone (steatite) or mica schist

Possible industrial slag or basaltic volcanic glass

Likely iron-rich vitreous slag; natural alternative: basaltic glass (tachylite)

Hematite cameo or hematine imitation

Hematite (Fe₂O₃); possibly synthetic hematine or black glass

Sea Glass (Cobalt Blue)

Amorphous Silica (Glass with Cobalt additives)

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

Cardstock (Paper)

Cellulose (C6H10O5)n