Anthropogenic (Man Made Material Processed By Nature)

Cardstock (Paper)

Cellulose (C6H10O5)n

Diamond

Carbon (C)

Note: Item is not a geological specimen

Polyester mesh and Ethylene-vinyl acetate (EVA) polymer

Green Glass Slag

Amorphous Silicon Dioxide (SiO2) with metal oxide impurities

Likely polished greenstone or serpentine inlay

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

Chert

Microcrystalline quartz (SiO2)

Polished blue stone, likely sodalite or dyed quartz

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

Asphalt fragment

Bituminous concrete

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

Diamond

Native Carbon (C)

Pearl necklace

Pearl, primarily aragonite (CaCO₃) and conchiolin

Flint

Microcrystalline Quartz (SiO2)

Iron-oxide-stained sulfide-bearing rock, possibly pyrite-bearing schist

Likely quartz–mica schist or massive sulfide rock with pyrite (FeS₂) and limonite/goethite (FeO(OH)·nH₂O)

Likely polished agate or jasper

Microcrystalline quartz (SiO₂); exact variety cannot be determined from this photograph

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

Blue sodalite beads

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Likely citrine or yellow glass imitation in a silver-tone bracelet

Citrine: quartz, SiO₂; exact material cannot be confirmed visually

Tumbled black-and-white stone, likely dendritic agate or jasper

Cryptocrystalline quartz (SiO₂), possibly chalcedony with manganese-oxide dendrites

Polished agate bracelet (likely gray chalcedony)

Microcrystalline quartz, SiO₂; chalcedony/agate variety

Tumbled blue-green stone, likely chrysoprase or dyed chalcedony

Cryptocrystalline quartz (SiO₂), possibly nickel-bearing chrysoprase; exact identification requires testing

Shale

Fissile Mudstone (primarily composed of clay minerals and quartz)

Goldstone (Brown)

Aventurine glass

Faience and Carnelian in Egyptian Revival Jewelry

Faience (quartz frit) and Carnelian (chalcedony, SiO2)

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Tufa (Vesicular Limestone)

Tufa (form of Calcium Carbonate, CaCO3)

Pink tourmaline (rubellite)

Elbaite tourmaline, lithium sodium aluminum borosilicate: Na(Li1.5Al1.5)Al6(BO3)3Si6O18(OH)4

Chert (possibly a worked stone flake)

Microcrystalline quartz, SiO₂

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite and Quartz inclusions

Polished tiger’s-eye jasper (likely brecciated jasper)

Quartz-rich microcrystalline silica; mainly chalcedony/quartz (SiO₂) with iron-oxide pigments

Asphalt aggregate pavement

Bituminous asphalt concrete containing crushed stone aggregate

Chert (Arrowhead/Projectile Point)

Cryptocrystalline Quartz (SiO2)

Blue glass-like bead or gemstone keychain ornament

Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various additives

Diamond (Cut Gemstone)

Natural Carbon (C)

Ferruginous Sandstone (Ironstone)

Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)

Green glassy mineral specimen, likely rough emerald or green fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph

Iron Slag

Ferrous Slag (Silicate/Oxide mixture)

Mixed Gemstone Beaded Jewelry

Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)

Sandstone

Sandstone (SiO2-rich clastic sedimentary rock)

Beach Quartzite Pebble

Quartzite (primarily SiO2)