Man Made Glass (Not A Natural Rock Or Mineral)

Opalite

Synthetic glass (SiO2 + metal additions)

Opalite

Synthetic Glass, SiO2 base with metallic inclusions

Blue glassy gemstone cabochon, likely dyed chalcedony or glass

Uncertain; possible dyed chalcedony (microcrystalline quartz, SiO₂)

Goldstone (Brown/Gold variety)

Aventurine Glass (SiO2 with Copper inclusions)

Man-made Crystal (Lead Glass)

Lead oxide-doped Silica Glass (approx. SiO2 + PbO)

Ironstone Concretion (Pot Stone)

Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)

Polished black stone, likely obsidian

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

Pet Rock (Man-made Quartzite or Granite Cobble)

Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Polished gemstone tower assortment

Primarily quartz varieties and simulants; apparent amethyst (SiO₂), rose quartz (SiO₂), clear quartz (SiO₂), fluorite (CaF₂), sodalite, malachite, and possibly dyed or composite stones

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Ocean Jasper Mushroom

Orbicular Jasper (Silicon Dioxide, SiO2 mixed with various impurities)

Aura Quartz Geodes (Lab-Altered)

Silicon Dioxide (SiO2) with Metallic Vapor Deposition

Carborundum

Silicon Carbide (SiC)

Tumbled clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Titanium Amethyst Geode

Silicon Dioxide (SiO2) with Titanium/Metal Vapor Deposition Layer

Concrete Fragment

Hardened Portland cement and mineral aggregate

Ring with an Orange Inlay

N/A (Man-made object)

Chert Concretion (with typical hematite/limonite staining)

Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Polymictic conglomerate or breccia (possibly concrete-like aggregate)

Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates

Quartz pebble (Quartztite fragment)

Silicon Dioxide (SiO2)

Rainbow Hematite Ring

Iron(III) oxide (Fe2O3) with thin-film coating

Green sea glass (likely)

Anthropogenic glass, not a mineral; composition commonly soda–lime silicate glass

Goldstone

Man-made glass with copper inclusions

Opalite

Synthetic Fluorescent Glass (SiO2 + impurities)

Tumbled opalite (likely synthetic glass)

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

Opalite

Synthetic Glass (Simulated Moonstone/Opal)

Opalite (a synthetic glass, often confused with Opal)

Silicon dioxide glass (SiO2nH2O, for natural opal)

Mohave Turquoise (Composite/Stabilized)

Hydrated copper aluminium phosphate (CuAl6(PO4)4(OH)8·4H2O) with stabilizing resin and metallic inclusions

Man-made Slag (Industrial Byproduct)

Anthropogenic Glassy Residue

One Pound Coin (UK)

Nickel-Brass Alloy (Cu-Zn-Ni)

Opalite

Synthetic Opalised Glass

Clear quartz fragment (rock crystal)

Quartz, silicon dioxide (SiO₂)

Sea Glass

Man-made silicate glass

Polished blue-green glassy slag or coated mineral fragment

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

Moldavite

Tektite (Impact Glass), ~80% SiO2 + Al2O3

Tumbled black stone, likely black obsidian

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

Faceted clear gemstone, likely quartz or glass imitation

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

Libyan Desert Glass

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

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) with polymer resins

Cubic Zirconia (Diamond Simulant)

Zirconium Dioxide (ZrO2)