Man Made Material, Not A Natural Rock Or Mineral Specimen

Beads (likely glass or man-made material)

N/A (artificial material)

Green glass-like cabochon, likely synthetic glass or resin

Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin

Asphalt Concrete (Bituminous Conglomerate)

Anthropogenic Bituminous Conglomerate

Asphalt (Road Aggregate)

Asphalt concrete / Bituminous mixture

Blue opalescent glass-like gemstone (possibly imitation opalite)

Likely man-made opalite glass; composition varies, typically silica-based glass

Goldstone (aventurine glass)

Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone

Not a rock, mineral, or geological specimen

Blue crystal pendant (likely blue glass or synthetic crystal)

Not identifiable from the image; possibly synthetic quartz or glass, rather than a natural mineral

Green glass sphere/marble

Soda-lime glass (primarily SiO2, Na2O, CaO)

N/A - Non-Geological Item

Gold ring with a clear faceted gemstone

Likely diamond (carbon, C); the photograph is insufficient to confirm the stone or metal

Opalite

Synthetic glass / Opalized glass

Unidentifiable Rock Fragment

Opalite-style glass pendant

Man-made opalescent glass (not natural opal)

Faceted clear gemstone in a gold-colored setting

Unidentified transparent faceted stone; possibly quartz, glass, or another colorless gem

Not a geological specimen

N/A (man-made object)

Asphalt Concrete

Bituminous conglomerate

Green stone fragment (unidentified)

Undetermined; possibly serpentine or greenstone, but the image is insufficient for identification

Blue goldstone (man-made glass)

Copper-bearing aventurine glass; synthetic silicate glass

Man-made Synthetic Material (Plastic/Composite)

Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)

Purple glassy pebble, possibly slag glass

Unidentified; likely man-made glass rather than a natural mineral

Iron-rich slag or ironstone; appearance is not diagnostic

Likely iron-oxide-rich material (hematite, Fe₂O₃, and/or magnetite, Fe₃O₄); possibly smelting slag

Concrete fragment with Aggregate

Anthropogenic Concrete with Calcarious and Siliceous Aggregate

Concrete / Anthropogenic Conglomerate

Man-made composite material (Portland cement, aggregate, and water)

Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Blue Obsidian (Cullet Glass)

Silicon Dioxide (Amorphous Glass)

Concrete Fragment

Hardened Portland Cement Composite

Chipped Glass/Plastic Fragment

Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic

Blue opalite glass cabochon (likely imitation opal)

Man-made opalescent glass; not a natural mineral

Unidentified gray rock fragment

Indeterminate from image; possibly quartz- or feldspar-rich silicate material

Opalite

Synthesized glass / Silicon dioxide glass

Concrete Paver (Artificial Cementitious Rock)

Hydrated Portland Cement Aggregate

Concrete

Anthropogenic Conglomerate

Opalite

Synthetic glass / Opaque silicious glass

Faceted glass-like gemstone object

Likely synthetic glass or cubic zirconia; exact material cannot be confirmed from the image

Painted River Rock

Artificially Coated Sedimentary Rock

Opalite

Man-made Glass (Synthetic Opalized Glass)

Asphalt (Bituminous Concrete)

Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)

Tumbled milky quartz

Quartz (SiO₂), cryptocrystalline-to-massive variety

Asphalt (Road Aggregate)

Bituminous conglomerate

Concrete

Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)

Diamond (or Simulant)

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