Man Made (Synthetic Rock)

Asphalt (Road Aggregate)

Asphalt concrete / Bituminous mixture

Opalite (likely man-made glass)

Opalite is a trade name for opalescent glass, not a natural mineral; composition is typically silica glass with additives

Blue Slag Glass

Man-made Silicon Dioxide (Amorphous)

Man-made Jewelry Charm (Enameled Metal)

Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.

Blue glassy mineral specimen, possibly dyed or synthetic

Uncertain; possible blue fluorite (CaF₂), dyed chalcedony, or man-made glass

Ceramic or Polished Stone Heart (Anthropogenic Material)

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

Likely blue glass or synthetic gemstone jewelry

Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)

Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)

Concretion (Sandstone)

Carbonate-cemented Sandstone Concretion

Carborundum (Silicon Carbide)

Silicon Carbide (SiC)

Sea Glass

Amorphous Silicon Dioxide (SiO2)

Cullet Glass / Slag Glass

Amorphous silica glass

One Pound Coin (UK)

Nickel-Brass Alloy (Cu-Zn-Ni)

Asphalt Concrete

Bituminous Concrete (Anthropic Rock)

White pebble, likely quartz or calcite

Indeterminate from image; possible microcrystalline quartz (SiO₂) or calcite (CaCO₃)

Tumbled Clear Quartz/Rock Crystal

Silicon Dioxide (SiO2)

Iron-rich slag or ironstone; appearance is not diagnostic

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

Conglomerate

Conglomerate (clastic sedimentary rock)

Blue opal heart cabochon

Common opal, hydrated amorphous silica (SiO₂·nH₂O), likely blue-dyed or synthetic opalite

Blue glass-like bead or gemstone keychain ornament

Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image

Concrete / Anthropogenic Conglomerate

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

Concrete rubble

Anthropogenic conglomerate

Concrete fragment with Aggregate

Anthropogenic Concrete with Calcarious and Siliceous Aggregate

Dzi Bead (Etched Chalcedony)

Cryptocrystalline Quartz (SiO2) with chemical etching

Slag

Anthropogenic Vitreous Silica/Iron oxides

Blue opalite glass cabochon (likely imitation opal)

Man-made opalescent glass; not a natural mineral

Polished opalite (likely man-made opalescent glass)

Opalite is a commercial name, not a mineral; typically opalescent glass, often soda-lime silicate glass

Tumbled opalite (likely synthetic glass)

Opalite; typically man-made opalescent soda-lime glass, not a recognized mineral species

Pink Cubic Zirconia (CZ)

Zirconium Dioxide (ZrO2)

Synthetic Faux Fur Fursuit

Polyacrylonitrile / Polyester (Synthetic Textile)

Diamond (or Simulant)

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

Slag

Glassy silicate byproduct (anthropogenic material)

Dragon's Breath (Mexican Opal Glass)

Artisan Foil Glass (SiO2 based)

Sandstone Concretion

Siliciclastic Concretion

Dalmatian Stone

Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)

Felsic Drill Core (likely Gneiss or Granite)

Felsic Metamorphic Rock (Gneissic profile)

Small rounded mineral pebble, possibly quartz

Uncertain; likely microcrystalline or crystalline SiO₂ (quartz), potentially with iron-oxide staining

Opalite (a synthetic glass, often confused with Opal)

Silicon dioxide glass (SiO2nH2O, for natural opal)

Sandstone-based Concrete Fragment

Cementitious Composite with Sedimentary Aggregate

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

Lava Rock with Fabric Impression

Scoria or Basalt with anthropogenic impressions