Man Made Rock Like Material

Blue Goldstone

Man-made glass with cobalt and metal flecks

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) with polymer resins

Dyed Aura Quartz

Silicon Dioxide (SiO2) with metallic coating

One Pound Coin (UK)

Nickel-Brass Alloy (Cu-Zn-Ni)

Pyrite in Quartz (Drill Core)

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

Cullet Glass (Slag)

Amorphous Silicon Dioxide (Man-made)

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

Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components

Opalite (Man-made Glass)

Fused glass (typically made of dolomite and metal opacifiers)

Opaline Glass (Opalite)

Synthetic Silicon Dioxide Glass

Sandstone Concretion

Clastic sedimentary rock (primarily Quartz SiO2)

Mystic Topaz (Treated Quartz or Topaz)

Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2] with thin-film metallic coating

Likely tumbled red mineral or glass imitation

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

Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)

Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)

Baked-clay ceramic fragment (likely brick or pottery)

Fired clay, primarily aluminosilicate minerals; not a natural rock

Opalite (Synthetic Opalized Glass)

Synthetic Silicon Dioxide (SiO2) glass

Green Sea Glass

Man-made vitreous material (silica glass)

Clear quartz fragment (rock crystal)

Quartz, silicon dioxide (SiO₂)

Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Obsidian (likely black volcanic glass)

Obsidian; primarily amorphous volcanic silica glass, approximately SiO₂-rich rhyolitic composition

Purple glassy pebble, possibly slag glass

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

Costume Jewelry with Synthetic Gemstones

Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)

Aura Quartz

Titanium or Gold bonded Silicon Dioxide (SiO2)

Green glass cabochon or tumbled stone

Indeterminate; likely man-made glass, possibly aventurine glass rather than a natural mineral

Concrete

Hydrated Portland Cement Aggregate Composite

Metal Alloy (Likely Pewter or Sterling Silver)

Not a natural geological specimen; composed of refined metals. If pewter, it's a tin-based alloy. If sterling silver, it's 92.5% silver and 7.5% other metals (usually copper).

Opalite

Man-made Glass (Synthetic Opalized Glass)

Cullet (Slag Glass)

Amorphous Silica (Industrial byproduct)

Green sea glass (likely bottle glass)

Man-made soda–lime silicate glass; not a natural mineral

Blue Crackle Quartz (Dyed Quarzite)

Silicon Dioxide (SiO2) with artificial dye

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Ferro-slag (Leland Blue/Slag Glass)

Anthropogenic Vitreous Silica (Industrial Slag)

Slag Glass

Vitreous Silicate Residue

Crushed Stone (Likely Limestone or Granite)

Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite

Opalite Egg

Synthetic Glass (Simulated Opal)

Synthetic Resin / Plastic Figurine

Synthetic Polymer (Copolymer of Polyethylene or Resin)

Dragon's Breath (Mexican Opal Glass)

Artisan Foil Glass (SiO2 based)

Goldstone (brown goldstone)

Man-made aventurine glass, typically copper-bearing silica glass

Carborundum

Silicon Carbide (SiC)

Opalite glass sphere (likely synthetic imitation)

Man-made opalescent glass; not natural opal

Opalite (likely man-made glass)

Opalite; amorphous silica glass, not a natural mineral

Opalite

Synthetic glass / Opalized glass

Dalmatian jasper

Porphyritic microcrystalline quartz-rich rock, commonly sold as Dalmatian jasper; spots are chiefly arfvedsonite/amphibole minerals, sometimes altered feldspar