Man Made Object (Metal Alloy)

Polished black pebble, possibly obsidian

Volcanic glass (obsidian), likely; identification is tentative from the image

Polished milky quartz (likely quartz worry stone or wand)

Quartz, silicon dioxide (SiO₂)

Concrete Fragment

Artificial Conglomerate (Cement and Aggregate)

Diamond (or Simulant)

Carbon (C)

Polished labradorite sphere

Labradorite, calcic plagioclase feldspar ((Ca,Na)(Al,Si)₄O₈)

Red-orange cabochon, likely carnelian or glass imitation

Carnelian: chalcedony (microcrystalline SiO₂), commonly iron-colored

United States Quarter Dollar

Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)

Sulfide Ore (likely Galena and Sphalerite in Quartz)

Lead-Zinc Ore (PbS and ZnS)

Amber Inlay Jewelry

Fossilized Resin (C10H16O)

Sea Glass

Silicon dioxide (mostly)

Aura Quartz (Anomalously Coated Quartz)

Silicon Dioxide (SiO2) treated with vaporized metals

Turquoise ring

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; the setting appears to be silver-colored metal

Polished banded agate pendant

Agate, a microcrystalline variety of chalcedony (SiO₂)

Black glassy fragment, likely obsidian or industrial glass

Volcanic glass (obsidian), chiefly amorphous SiO₂; identification uncertain from image

Polished black stone, likely obsidian

Obsidian (volcanic glass; mostly silica-rich rhyolitic composition)

Black tumbled stone, possibly obsidian

Obsidian (volcanic glass; predominantly SiO₂), identification uncertain from image

Sea Glass

Amorphous Silicon Dioxide (Man-made glass weathered by nature)

Goldstone

N/A (Synthetic Glass with Copper Inclusions)

Quartz pebble (Quartztite fragment)

Silicon Dioxide (SiO2)

Green sea glass (likely bottle glass)

Man-made soda-lime silicate glass; not a natural mineral

Gold

Aurum (Au)

Faceted brown gemstone pendant, likely smoky quartz or champagne topaz

Probably quartz (SiO₂), smoky variety; alternatively topaz (Al₂SiO₄(F,OH)₂)

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Copper

Native Copper (Cu)

Chert (Arrowheads)

Microcrystalline Quartz (SiO2)

Bismuth Crystal

Bismuth (Bi)

Iron Meteorite

Iron-nickel alloy (e.g., Kamacite, Taenite)

Blue chalcedony (likely dyed or treated)

Microcrystalline quartz, SiO₂ (chalcedony)

Aquamarine

Beryl (Be3Al2Si6O18)

Polished brecciated jasper pendant

Jasper, an opaque microcrystalline variety of chalcedony (mostly SiO₂), with iron-oxide staining and likely brecciation

Sandstone Concretion

Clastic sedimentary rock (primarily Quartz SiO2)

Amethyst gemstone ring

Quartz, purple variety — SiO₂

Exposed Aggregate Concrete (Pea Gravel)

Concrete with Siliceous Alluvial Gravels

Gemstone bead necklace (likely citrine or yellow quartz)

Quartz, SiO₂; precise identification is uncertain because the beads are blurred and metal settings obscure them

Carnelian cabochon pendant

Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)

Concrete Fragment

Hardened Portland cement and mineral aggregate

Tumbled milky chalcedony (likely common opalite-like quartz)

Chalcedony, microcrystalline SiO₂; possibly pale common opal, hydrated SiO₂·nH₂O

Bismuth

Native Bismuth (Bi)

Black onyx or black agate bead bracelet

Microcrystalline quartz, chiefly chalcedony (SiO₂); commonly sold as black onyx, sometimes dyed black agate

Faceted transparent gemstone pendant

Likely cubic zirconia (zirconium dioxide, ZrO₂); possibly diamond or synthetic moissanite

Polished obsidian

Volcanic glass; predominantly rhyolitic SiO₂

Goldstone (Red/Brown)

Aventurine Glass (SiO2 with Copper inclusions)