Man Made Glass (Often Grouped With Minerals In Lapidary)

Porcelain (White Ceramic)

Mullite-bearing Vitrified Ceramic (Major phases: Mullite Al6Si2O13, Glassy Silica SiO2)

Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)

Amorphous Silicon Dioxide (SiO2) with chemical additives (e.g., Cobalt for blue color)

Dyed Imperial Jasper (Sea Sediment Jasper)

Silicon Dioxide (SiO2) - Impure Quartz/Chalcedony

Blue Cracked Quartz (Dyed Fire Crackle Quartz)

Silicon Dioxide (SiO2) with synthetic dye

Obsidian (likely black volcanic glass)

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

Polished black stone, likely obsidian

Obsidian (volcanic glass; mostly silica-rich rhyolitic composition)

Aura Quartz (Rainbow Quartz)

Silicon Dioxide (SiO2) with metallic vapor coatings

Mother of Pearl (Nacre)

Aragonite (CaCO3) with Organic Matrix

Hematite

Iron(III) oxide (Fe2O3)

Likely clear quartz crystal or glass-like gemstone

Quartz, silicon dioxide (SiO₂); exact identification is uncertain from the strongly magenta-lit image

Polished blue-green glassy slag or coated mineral fragment

Most likely man-made colored glass/slag; exact composition cannot be determined visually

Nickel coin (U.S. currency)

Cupronickel (75% Copper, 25% Nickel alloy)

Likely tumbled epidote-bearing rock or green jasper

Epidote-group silicate, possibly in a jasper or serpentinite matrix

Concrete Fragment

Hardened Portland cement and mineral aggregate

Blue goldstone

Man-made aventurine glass containing metallic copper particles; not a natural mineral

Smelter Slag

Anthropogenic Silicate Slag

Aqua Aura Quartz

Silicon Dioxide (SiO2) bonded with Gold (Au)

Quartzite (Engineered Stone)

Silicon Dioxide (SiO2) based synthetic composite

Pyrite Concretion (Grapestone)

Iron Sulfide (FeS2) Concretion

Libyan Desert Glass

Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)

Clay (as a rock-forming material)

Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)

Faceted clear gemstone, likely quartz or glass imitation

Most likely quartz (SiO₂); exact identification requires refractive-index and hardness tests

Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)

Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)

Carborundum

Silicon Carbide (SiC)

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).

Asphalt (Bituminous Concrete)

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

Tumbled black obsidian (likely)

Volcanic glass; chiefly silica-rich rhyolitic glass (SiO₂)

Man-made Jewelry (Metal and Glass/Plastic)

Synthetic Alloy and Amorphous Solid (SiO2/Polymer)

Granodiorite

Granodiorite

Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Aura Quartz (Titanium-coated Quartz)

Silicon Dioxide (SiO2) with metallic vapor coating

Cubic Zirconia

Cubic Zirconium Dioxide (ZrO2)

Cullet (Slag Glass)

Amorphous Silica (Industrial byproduct)

Goldstone

N/A (Synthetic Glass with Copper Inclusions)

Slag Glass (Cullet)

Amorphous Silica / Glass residue

Possible obsidian or slag glass

Volcanic glass, primarily SiO₂; alternatively industrial iron-rich glassy slag

Blue opal heart cabochon

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

Polished black stone, likely black obsidian

Obsidian (volcanic glass), chiefly silica-rich rhyolitic composition

Conglomerate

Conglomerate Rock (Paraconglomerate)

Aura Quartz (specifically Titanium Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti Coating)

Blue-green cabochon, likely chalcedony or treated glass imitation

Cryptocrystalline quartz (chalcedony/possibly chrysoprase); identification uncertain from image

Blue Sapphire (Synthetic or Man-made Glass Imitation)

Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic