Man Made Material (Jewelry, Metal Alloy)

Tumbled black obsidian (likely)

Volcanic glass; chiefly silica-rich rhyolitic glass (SiO₂)

Fluorite (Polished Point/Tower)

Calcium Fluoride (CaF2)

Michigan Float Copper

Native Copper (Cu)

Weathered metallic meteorite (probable iron meteorite)

Fe–Ni alloy, mainly kamacite and taenite; exact classification requires chemical and petrographic testing

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Faience and Carnelian in Egyptian Revival Jewelry

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

Blue-dyed tumbled quartz or glass imitation

Quartz (SiO₂), appearance possibly enhanced with blue dye; identity uncertain from image

Green Agate

Silicon dioxide (SiO₂)

Quartz crystal (likely clear quartz)

Quartz, silicon dioxide (SiO₂)

Sandstone Anvil / Nutting Stone

Quartzose Sandstone (Sedimentary Rock)

Quartzite (Engineered Stone)

Silicon Dioxide (SiO2) based synthetic composite

Chert Concretion (with typical hematite/limonite staining)

Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)

Sandstone Concretion

Clastic Sedimentary Rock (primarily SiO2 with mineral cement)

Pyrite Concretion (Grapestone)

Iron Sulfide (FeS2) Concretion

Diamond

Carbon (C)

Native Copper

Native Copper (Cu)

Iron Meteorite

Iron-Nickel Alloy (Kamacite and Taenite)

Ferruginous Sandstone (Gozzan)

Iron-rich clastic sedimentary rock with Limonite/Goethite

Cupronickel (on a 1981 Mexico 20 Pesos coin)

Copper-Nickel Alloy (Cu75Ni25)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Polished iron meteorite fragment

Iron meteorite, chiefly kamacite and taenite (Fe–Ni alloys), possibly weathered or etched

Cut faceted gemstone, possibly diamond or quartz

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

Pet Rock (Man-made Quartzite or Granite Cobble)

Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica

Native copper-bearing rock

Native copper (Cu), likely with copper oxides/carbonates in a host rock

Diamond (in a jewelry setting)

Cubic Carbon (C)

Bismuth

Bismuth (Bi)

Gemstone butterfly brooch/pendant

Likely faceted pink tourmaline or synthetic spinel in gilt metal; exact identification requires testing

Silicon

Element Si

Baked-clay ceramic fragment (likely brick or pottery)

Fired clay, primarily aluminosilicate minerals; not a natural rock

Conglomerate

Conglomerate Rock (Paraconglomerate)

Sandstone Concretion

Clastic sedimentary rock (primarily Quartz SiO2)

Green aventurine bead bracelet

Quartz (SiO₂), typically green quartzite/aventurine colored by fuchsite mica or other inclusions

Turquoise bracelet

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O

Gold

Native Gold (Au)

Amber (likely a small polished amber piece)

Natural fossil resin; amber is an organic mineraloid, not a crystalline mineral. The image alone cannot confirm authenticity.

Polished banded agate pendant

Agate, a microcrystalline variety of chalcedony (SiO₂)

Blue Sapphire (Synthetic or Man-made Glass Imitation)

Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic

Milky Quartz

Silicon Dioxide (SiO2)

Fired Clay Brick (Anthropic Rock substitute)

Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)

Buffalo Nickel (Indian Head Nickel)

Cupronickel (75% Copper, 25% Nickel)

Moissanite

Silicon Carbide (SiC)

Likely iron meteorite fragment

Iron–nickel meteorite, commonly kamacite–taenite (Fe–Ni alloy)