Anthropogenic (Man Made Material Processed By Nature)

Diamond

Native Carbon (C)

Green Glass Slag

Amorphous Silicon Dioxide (SiO2) with metal oxide impurities

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)

Tufa (Vesicular Limestone)

Tufa (form of Calcium Carbonate, CaCO3)

Blue sodalite beads

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Note: Item is not a geological specimen

Polyester mesh and Ethylene-vinyl acetate (EVA) polymer

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

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)

Asphalt fragment

Bituminous concrete

Diamond (Cut Gemstone)

Natural Carbon (C)

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite and Quartz inclusions

Polished agate bracelet (likely gray chalcedony)

Microcrystalline quartz, SiO₂; chalcedony/agate variety

Pink tourmaline (rubellite)

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

Asphalt aggregate pavement

Bituminous asphalt concrete containing crushed stone aggregate

Mixed Gemstone Beaded Jewelry

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

Chert (Arrowhead/Projectile Point)

Cryptocrystalline Quartz (SiO2)

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

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

Chert / Yellow Jasper

Microcrystalline Quartz (SiO2)

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Faience and Carnelian in Egyptian Revival Jewelry

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

Goldstone (Brown)

Aventurine glass

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

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Ferruginous Sandstone (Ironstone)

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

Sandstone

Sandstone (SiO2-rich clastic sedimentary rock)

Lapis lazuli bead bracelet

Lazurite-bearing calcite–pyrite rock; lazurite formula (Na,Ca)₈(AlSiO₄)₆(S,SO)₂

Pyrite

Iron Sulfide (FeS2)

Polished amethyst bead fragments

Amethyst, purple quartz (SiO₂)

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various additives

Beach Quartzite Pebble

Quartzite (primarily SiO2)

Banded sandstone pebble

Lithic or quartz-rich sandstone; exact composition requires testing

Polished orbicular jasper (likely ocean jasper)

Jasper, a microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions

Megalodon Shark Tooth

Otodus megalodon

Botryoidal chrysocolla-rich copper ore

Chrysocolla, hydrated copper phyllosilicate (approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O), likely with malachite and quartz/gangue

Blue-dyed magnesite beads (often sold as “turquoise howlite”)

Magnesite, MgCO₃; commonly dyed blue and possibly marketed as dyed howlite, Ca₂B₅SiO₉(OH)₅

Tumbled carnelian agate

Microcrystalline quartz (chalcedony), SiO₂; iron-oxide colored

Cut faceted gemstone, possibly diamond or quartz

Uncertain from the blurred image; diamond is crystalline carbon (C), while quartz is silicon dioxide (SiO₂)

Decorative opal-like turtle mosaic

Likely imitation or assembled opal material; exact stones cannot be confirmed visually

Red cabochon gemstone ring (likely ruby or red spinel; identity unconfirmed)

Possibly corundum (ruby, Al₂O₃) or spinel (MgAl₂O₄); visual identification alone cannot distinguish these from glass or synthetic stones.

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