Mineral Based Human Made Alloy

Blue glassy mineral fragment, possibly sodalite or dyed/cobalt glass

Uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) if natural, but vivid blue color may indicate cobalt-colored glass

Gold (Elemental Metal)

Gold (Au)

Polished orbicular granite heart

Granite, commonly quartz–alkali feldspar–plagioclase–biotite granite; exact locality-dependent

Carved serpentine pendant

Serpentine-group minerals, commonly antigorite/lizardite (Mg₃Si₂O₅(OH)₄), possibly mixed with chlorite or other inclusions

Yellow faceted gemstone, likely citrine or synthetic glass

Citrine (quartz, SiO₂) is the leading natural possibility; visual identification is uncertain from the photograph

Sandstone-based Concrete Fragment

Cementitious Composite with Sedimentary Aggregate

Opalite

Synthetic Glass (Simulated Opal)

Polished blue glassy mineral specimen, likely sodalite or blue aventurine

Most consistent with sodalite (Na₈Al₆Si₆O₂₄Cl₂), though dyed quartzite or blue glass cannot be excluded from the photograph

Exposed aggregate concrete (stone-chip surface)

Portland-cement concrete containing natural aggregate; not a natural rock

Conglomerate

Conglomerate (clastic sedimentary rock)

Polished milky quartz (likely quartz worry stone or wand)

Quartz, silicon dioxide (SiO₂)

Polished amethyst-bearing quartz

Quartz, SiO₂; purple coloration from irradiation and trace iron

Native Copper

Native Copper (Cu)

Sandstone

Arenite (SiO2 principal)

Gold (10K Alloy)

Aurum (Au) with alloying metals (Cu, Ag, Zn)

Opalite

Synthetic Glass (typically Silica/Magnesium based with metal additives)

Tumbled chalcedony (likely moss or dendritic agate)

Microcrystalline quartz, SiO₂, with iron-oxide inclusions

Tumbled fossil shark tooth pendant

Likely fossilized shark tooth, possibly Otodus or Carcharhinus; exact species cannot be confirmed from the image

Opalite (likely man-made opalescent glass)

Opalite; not a true mineral, typically synthetic opalescent glass (silica-based)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Dragon's Breath (Mexican Opal Glass)

Artisan Foil Glass (SiO2 based)

Goldstone (Brown/Gold)

Aventurine Glass (Man-made glass with Copper inclusions)

Copper

Native Copper (Cu)

Ring with an Orange Inlay

N/A (Man-made object)

Native Copper (in coinage alloy)

Copper (Cu)

Pearl

Calcium Carbonate (CaCO3) with Conchiolin

Zinc Alloy (Silver-plated)

Zinc Alloy Casting (Zn-Al-Mg-Cu)

Yellow faceted gemstone, likely citrine or yellow sapphire

Uncertain; probable quartz (SiO₂) or corundum (Al₂O₃)

Flint / Chert

Microcrystalline quartz (SiO2)

Beryl (Aquamarine variety)

Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)

Conglomeratic concrete or asphalt aggregate surface with dark bituminous chunks

Polymictic gravel aggregate; dark pieces likely bitumen/asphalt, not a natural rock

Fossil shark tooth, likely megalodon

Fossilized shark tooth; possibly Otodus megalodon (formerly Carcharocles megalodon)

Polished/tumbled brown-and-white mineral fragment

Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral

Dark gray rounded stone, possibly basalt or slag

Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or iron-rich industrial slag

Decorative mosaic cross containing mixed rock and glass fragments

Polychrome aggregate; likely quartz, feldspar, marble, granite, and assorted colored glass

Goldstone (blue-goldstone–style glass) beads

Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

Bismuth crystal

Bismuth (Bi), artificially crystallized

Native Copper

Native Copper (Cu)

Carved labradorite fish

Labradorite, calcium-rich plagioclase feldspar (approximately (Ca,Na)(Al,Si)₄O₈)

Concrete-like aggregate surface with embedded rock fragments

Anthropogenic concrete or exposed aggregate; not a natural rock specimen

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)