Man Made Object (Metal Alloy)

Sandstone Concretion

Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)

Diamond Druzy (Crystalline Diamond)

Carbon (C)

Aura Quartz (Titanium/Rainbow Quartz)

SiO2 (Silicon Dioxide) with metallic coating

Libyan Desert Glass

Libyan Desert Glass (SiO2 with trace elements)

Weathered iron-rich concretion or ironstone nodule

Goethite–hematite limonite concretion (FeO(OH), Fe₂O₃, and hydrated iron oxides)

Mother of Pearl (Nacre)

Aragonite (CaCO3) with Organic Matrix

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Opalite

Synthetic Opalized Glass (SiO2 + additives)

Sea Glass (specifically Frosted White)

Amorphous Silica (substance: Sodium-calcium silicate glass)

Copper-bearing rock, likely native copper in a matrix

Native copper (Cu), possibly with cuprite/malachite in a basaltic or porphyritic matrix

Faceted transparent gemstone pendant

Uncertain from image; likely faceted quartz (SiO₂), cubic zirconia (ZrO₂), or glass imitation

Tumbled milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Diamond

Carbon (C)

Milky quartz (likely rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Metallic Ornament / Jewelry

N/A - This is an artificial object, not a geological specimen.

Blue glassy gemstone cabochon, likely dyed chalcedony or glass

Uncertain; possible dyed chalcedony (microcrystalline quartz, SiO₂)

Native Copper

Native Copper (Cu)

Opalite (likely man-made glass)

Opalite; amorphous silica glass, not a natural mineral

Silver (Native or Alloyed)

Ag (Argentum)

Possible iron meteorite

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

Galena (lead sulfide)

Galena, PbS

Copper-bearing rock, likely native copper in a weathered matrix

Native copper (Cu), tentatively with copper sulfide/oxide minerals

Carborundum (Silicon Carbide)

Silicon carbide (SiC)

Dyed Agate / Painted Stone

Silicon Dioxide (SiO2) with artificial pigment

Cultured Marble (Synthetic)

Polymer-matrix composite (typically calcium carbonate in polyester resin)

Carborundum (Silicon Carbide)

Silicon Carbide (SiC)

Diamond (in a jewelry setting)

Carbon (C)

Chalcopyrite on Quartz

Copper Iron Sulfide (CuFeS2)

White quartz pebble

Quartz (SiO₂), likely milky quartz

Black-and-white agate geode pendant

Agate (microcrystalline quartz, SiO₂), likely a hollow geode slice with chalcedony and drusy quartz

Fossilized sea urchin

Echinoid test, likely a regular sea urchin; calcite (CaCO₃)

Cupronickel Coin

Copper-Nickel Alloy (typically 75% Cu, 25% Ni)

Opalite

Synthetic Glass (Simulated Opal)

Gold Nugget

Native Gold (Au)

Tourmalinated quartz point

Quartz (SiO₂) with black tourmaline (schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) inclusions

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial byproduct)

Sandstone Concretion

Septarian or Carbonate-cemented Sandstone Concretion

Tumbled quartz pebble

Quartz, silicon dioxide (SiO₂), likely milky quartz

Small greenish crystal/mineral fragment

Indeterminate; possibly olivine, quartz, or a green gemstone fragment

Silver (Jewelry form)

Native Silver (Ag)

Native bismuth

Bismuth (Bi), commonly forming hopper crystals or aggregates