Man Made Object (Metal Alloy)

Likely iron-rich slag or weathered ironstone fragment

Uncertain; possibly iron oxide–rich material (hematite/goethite) or industrial iron slag

Blue-green faceted gemstone, possibly glass or synthetic material

Not identifiable from the image; possible synthetic spinel or glass

Asphalt (Road Aggregate)

Bituminous conglomerate

Crushed Stone (Likely Limestone or Granite)

Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite

Sandstone Concretion

Limonitic Sandstone Concretion

Polished obsidian

Volcanic glass; predominantly rhyolitic SiO₂

Tumbled milky chalcedony (likely common opalite-like quartz)

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

Diamond (in a gold ring)

Diamond (pure carbon, C)

Terrazzo (Man-made Composite)

Cementitious or Resin-bound Lithic Composite

Cassiterite (Tin Ore)

Cassiterite (Tin(IV) Oxide, SnO2)

Mineral Sand (Heavy Mineral Sand Concentrate)

Placer deposit concentrate containing minerals such as ilmenite, rutile, zircon, and magnetite

Concrete Paver (Artificial Cementitious Rock)

Hydrated Portland Cement Aggregate

Unidentifiable Rock Fragment

Asphalt Concrete (Bituminous Conglomerate)

Anthropogenic Bituminous Conglomerate

Celestine (Celestite)

Celestine (Strontium Sulfate, SrSO4)

Concrete Rubble with Aggregate

Hardened Portland Cement Paste with Coarse Aggregate

Obsidian

Volcanic glass

Concrete

Anthropogenic Conglomerate

Banded agate cabochon

Microcrystalline quartz (chalcedony), SiO₂

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Man-made)

White cabochon gemstone, likely milky chalcedony or opalite

Chalcedony: microcrystalline quartz, SiO₂; appearance may also indicate synthetic opalite glass

Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Copper Ore

Native Copper (Cu) often found with Chalcocite (Cu2S) or Bornite (Cu5FeS4)

Mixed small pebbles and mineral grains

Unidentified detrital sediment; likely quartz-, feldspar-, and lithic fragments

Sea Glass

Man-made vitreous material / Silicon dioxide

Possibly a metallic iron-rich meteorite

Undetermined iron meteorite; composition cannot be confirmed from the image

Tumbled black stone, likely black obsidian

Obsidian; volcanic glass, typically rhyolitic composition (SiO₂-rich)

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Native copper nugget

Copper (Cu), commonly with cuprite and copper-oxide alteration

Amber cabochon pendant

Amber (fossilized plant resin), chiefly polymerized diterpenoid resin

Beaded gemstone bracelet

Indeterminate; likely small polished mineral beads, possibly turquoise or dyed stone, with metal and glass components

Aggregate Concrete

Anthropogenic Conglomerate (Technosol)

Asphalt Concrete

Bituminous Concrete

Opaline Glass (Opalite)

Synthetic Silicon Dioxide Glass

Titanium Aura Quartz

Titanium bonded Silicon Dioxide (SiO2 + Ti)

Blue Diamond

Carbon with Boron impurities (C)

Clear Quartz Sphere (Rock Crystal)

Silicon Dioxide (SiO2)

Iron meteorite (probable)

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

Granite (with Beryl/Aquamarine)

Granite (Feldspar, Quartz, Mica, and Beryl Be3Al2Si6O18)

Faceted clear gemstone ring, likely quartz or glass imitation

Unidentified colorless faceted material; quartz (SiO₂) is possible, but the image cannot distinguish it from glass or another gem

Iron Meteorite

Iron-Nickel Meteorite (primarily composed of kamacite and taenite alloys)

Aura Quartz (Titanium Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti)