Synthetic (Man Made Glass)

One Pound Coin (UK)

Nickel-Brass Alloy (Cu-Zn-Ni)

Polished green-and-black banded cabochon (likely malachite imitation or dyed agate)

Uncertain; possible malachite (Cu₂CO₃(OH)₂), banded agate (SiO₂), or man-made glass

Green Sea Glass

Man-made silicate glass (weathered)

Blue Slag Glass

Man-made Silicon Dioxide (Amorphous)

Red gemstone ring, likely garnet or synthetic ruby

Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish

Polymer Clay (Mock Mineral)

Polyvinyl chloride (PVC) with plasticizers and pigment

Milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Tumbled Clear Quartz/Rock Crystal

Silicon Dioxide (SiO2)

Blue glassy gemstone-like specimen

Indeterminate; possibly dyed or treated turquoise, blue apatite, or man-made glass

Colorless faceted gemstone, likely glass or quartz

Uncertain; possibly quartz (SiO₂), but the strong uniform brilliance and apparent molded/faceted form may indicate leaded glass or cubic zirconia

Tumbled milky quartz

Quartz — silicon dioxide (SiO₂), cryptocrystalline or microcrystalline variety possible

Goldstone (Red)

Aventurine Glass (SiO2 + Cu)

Terrazzo (Man-made Composite)

Cementitious or Resin-bound Lithic Composite

Green Sea Glass

Man-made vitreous material (silica glass)

Blue Goldstone

Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)

Quartz crystal fragment (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Tumbled milky quartz

Quartz (SiO₂), cryptocrystalline-to-massive variety

Diamond (or Simulant)

Carbon (C) or relevant simulant formula (e.g., ZrO2 for Cubic Zirconia)

Pearl and Garnet Glass

Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass

Clear Quartz Sphere (Rock Crystal)

Silicon Dioxide (SiO2)

Sea Glass

Amorphous silicon dioxide (man-made glass weathered by nature)

Blue Slag Glass

Anthropogenic Amorphous Silicon Dioxide

Not a geological specimen

N/A (man-made object)

Beads (likely glass or man-made material)

N/A (artificial material)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), opaque-to-translucent milky variety

Sea Glass

Man-made silicate glass (Amorphous silicon dioxide)

Green Quartz / Chrysoprase / Sea Glass

Silicon Dioxide (SiO2)

Note on Image Identification: Textile

N/A (Anthropogenic material)

Clear quartz fragment

Quartz (silicon dioxide, SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Likely tumbled red mineral or glass imitation

Indeterminate; possibilities include red jasper (microcrystalline quartz, SiO₂) or dyed chalcedony

Artificial Rock Face (Faux Rock)

Glass Fiber Reinforced Concrete (GFRC)

Sea Glass

Man-made vitreous material (silica-based glass)

Man-made earbud charging case (Not a rock or mineral)

Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components

Diamond

Native Carbon (C)

Sea Glass

Man-made silicate glass weathering product

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Tumbled white chalcedony (likely milky quartz)

Chalcedony, microcrystalline quartz (SiO₂)

Tumbled milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Milky quartz (likely rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH)2)

Faceted gemstone in a jewelry setting

Indeterminate from image; likely quartz, cubic zirconia, or another transparent faceted stone