Anthropogenic (Man Made Material Processed By Nature)

Flint (chert)

Microcrystalline quartz (SiO₂), commonly called chert or flint

Polished orbicular jasper (likely ocean jasper)

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

Lapis lazuli bead bracelet

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

Chert / Yellow Jasper

Microcrystalline Quartz (SiO2)

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

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.

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Likely slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Polished amethyst bead fragments

Amethyst, purple quartz (SiO₂)

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

Pyrite

Iron Sulfide (FeS2)

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

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

Clear quartz crystal beads

Quartz (silicon dioxide, SiO₂)

Tumbled carnelian agate

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

Polished greenstone/serpentine pebble (probable)

Serpentinite, dominated by serpentine-group minerals (lizardite/chrysotile); possible accessory olivine or chlorite

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

Banded sandstone pebble

Lithic or quartz-rich sandstone; exact composition requires testing

Chert (Flint)

Microcrystalline Quartz (SiO2)

Tumbled pale-yellow chalcedony (possibly yellow jasper)

Microcrystalline quartz, SiO₂; chalcedony/jasper varieties

Chert (Flint)

Silicon dioxide (SiO2)

Banded agate bangle

Agate (microcrystalline quartz, SiO₂), likely gray-blue chalcedony with parallel banding

Granite

Granite (Felsic Plutonic Rock)

Chert (flint), brown variety

Microcrystalline quartz (SiO₂)

Green tourmaline (likely chrome/dravite tourmaline crystals)

Tourmaline-group cyclosilicate; commonly elbaite, dravite, or chromdravite, complex borosilicate formula

Likely tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), potentially hematite/goethite-bearing

Polished yellow-green serpentine pendant

Serpentine-group minerals, chiefly antigorite and/or lizardite; approximate formula Mg3Si2O5(OH)4

Tumbled carnelian (likely chalcedony)

Carnelian, orange-red cryptocrystalline quartz (SiO₂), a variety of chalcedony

Black tourmaline beads (likely schorl)

Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Iron Slag

Ferrous Slag (Industrial Byproduct)

Polished black-and-white banded agate (likely dyed or painted)

Chalcedony (microcrystalline quartz), SiO₂; exact banding variety uncertain

Tumbled carnelian

Carnelian, a red-orange variety of chalcedony (microcrystalline quartz, SiO₂)

Amethyst and smoky quartz jewelry

Amethyst: purple quartz, SiO₂; likely smoky quartz: irradiated/naturally colored quartz, SiO₂

Petrified Wood

Silicified Wood (primarily SiO2)

Likely industrial slag or weathered basalt

Basaltic rock; possibly iron-rich furnace slag (diagnosis uncertain from image)

Rounded quartz pebble

Quartz (silicon dioxide, SiO₂)

Polished gemstone beads, likely mixed agate or jasper

Likely microcrystalline quartz (SiO₂); exact varieties cannot be confirmed from the photograph

Copper Ore

Cupriferous rock mixture (contains Chalcopyrite and Bornite)

Granite

Granite (composed mainly of Quartz, Feldspar, and Mica)

Gold-colored gemstone ring, likely citrine or glass imitation

Indeterminate from image; possible quartz (SiO₂) or yellow glass set in gold-colored metal

Brown Jasper (Likely)

Jasper (Cryptocrystalline Silicon Dioxide - SiO2)