Anthropogenic (Man Made Material Processed By Nature)

Chert (Arrowhead)

Microcrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) - Opaque variety of Chalcedony/Quartz

Rainbow Hematite (Man-made/Treated)

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

Polished amber-like agate or jasper carving

Likely chalcedony (microcrystalline SiO₂), possibly iron-stained carnelian/jasper; exact identification requires testing

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)

Possible tektite or iron-rich slag-like natural specimen

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

Possible sodalite-bearing rock

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, likely in a feldspathic matrix

Tumbled tiger’s-eye

Quartz variety, chiefly fibrous chalcedony pseudomorph after crocidolite; SiO₂

Opalite

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

Obsidian Arrowhead

Volcanic Glass (Primary composition: SiO2)

Chrysocolla-bearing copper ore

Primarily chrysocolla, a hydrated copper silicate (approx. Cu₂−xAlx(H₂−xSi₂O₅)(OH)₄·nH₂O); exact identification is uncertain from the image.

Tumbled yellow-green chalcedony or serpentine

Microcrystalline quartz (SiO₂), possibly chrysoprase; alternative: serpentine-group mineral

Tumbled black stone, likely black obsidian

Obsidian; volcanic glass, typically rhyolitic composition (SiO₂-rich)

Gold ring with a dark, possibly gemstone setting

Gold alloy; the dark setting is not identifiable from the image

Chert

Microcrystalline quartz (SiO2)

Chert (likely flint)

Microcrystalline quartz, SiO₂

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

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

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

Asphalt (Bituminous Pavement Bit)

Bitumen-bound aggregate (Petrochemical-bound composite)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Translucent pale-green bangle, likely jade

Possibly jadeite (NaAlSi₂O₆) or nephrite (a tremolite–actinolite amphibole); the image alone cannot distinguish them reliably

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Tumbled carnelian (likely)

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

Asphalt Pavement (with aggregate)

Asphalt concrete

Chert Arrowhead

Microcrystalline Quartz (SiO2)

Chert (Nodule)

Chert (Alpha-Quartz, SiO2)

Sea Glass (Cobalt Blue)

Amorphous Silica (Glass with Cobalt additives)

Green Slag Glass

Cullet (Amorphous Silicon Dioxide with impurities)

Yellow Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

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

Dyed Dragon Vein Agate

Silicon Dioxide (SiO2) with artificial pigment

Quartzite pebble

Quartzite (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Pyrite-rich sulfide ore (likely pyrite with chalcopyrite)

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

Libyan Desert Glass

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

Aura Quartz / Rainbow Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

White quartz bead strand (likely milky quartz)

Quartz, silicon dioxide (SiO₂), crystalline silica

Diamond ring

Diamond (crystalline carbon, C)

White Marble

Recrystallized Calcite (CaCO3)

Tumbled blue gemstone, likely blue quartz or dyed chalcedony

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

Black tourmaline (schorl) on quartz matrix

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