Man Made Material, Not A Natural Rock Or Mineral Specimen

Weathered dark mineral/rock fragment

Indeterminate; possibly iron-rich basalt, slag, or a sulfide-bearing mineral

Opalite (Synthetic Opalized Glass)

Synthetic Silicon Dioxide (SiO2) glass

Aura Quartz (Rainbow Quartz)

Silicon Dioxide (SiO2) with metallic vapor coatings

Iron Slag (Industrial Byproduct)

Anthropogenic Vitrification Product/Ferrous Slag

Goldstone (aventurine glass)

Man-made copper-bearing glass; not a natural mineral (commonly sold as blue/brown goldstone)

Titanium Aura Quartz (Bismuth-coated Druzy)

Silicon Dioxide (SiO2) with Titanium/Metal vapor coating

Opalite crescent pendant

Opalite (man-made opalescent glass; not a natural mineral)

Blue Goldstone

Man-made glass infused with copper crystals

Opalite

Synthetic Opalite Glass (Silicon Dioxide)

Unidentified gray stone/concrete-like fragment

Indeterminate; likely a fine-grained carbonate or cementitious geological fragment

Tumbled black stone, likely black obsidian

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

Opalite (Man-made Glass)

Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)

Agate and millefiori glass jewelry

Agate: microcrystalline quartz (SiO₂); millefiori element appears to be man-made glass

Goldstone

Aventurine Glass (Man-made glass with copper inclusions)

Faceted clear gemstone, likely quartz or glass imitation

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

Diamond

Native Carbon (C)

Goldstone (Red)

Aventurine Glass (Cupriferous glass)

Likely tumbled red mineral or glass imitation

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

Sea Glass

Man-made vitreous material

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), opaque-to-translucent milky variety

Colorless quartz crystal (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Likely beach-worn glass and a pebble

The brown piece appears to be weathered glass (amorphous SiO₂-rich material); the pale piece is likely a small quartz-rich stone, possibly milky quartz.

Mystic Topaz (Treated Quartz or Topaz)

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

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Rounded graywacke or sandstone cobble

Lithified clastic sandstone; likely quartz–feldspar–lithic grain aggregate in a silica or calcite matrix

Opalite

Man-made opalescent glass

Chert Concretion (with typical hematite/limonite staining)

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

Chakra Stone (Composite / Man-made Bonded Gemstones)

Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)

Green glass cabochon or tumbled stone

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

Opalite (Synthetic Moonstone/Sea Opal)

Silicon Dioxide (SiO2) glass with metallic inclusions

Opalite

Man-made Opalized Glass (Synthetic Glass)

Blue Obsidian

Volcanic Glass (Amorphous)

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

Dragon's Breath (Mexican Opal Glass)

Artisan Foil Glass (SiO2 based)

Aura Quartz (Pink/Rose Aura Quartz)

Silicon Dioxide (SiO2) bonded with Platinum and/or Silver

Aura Quartz (Titanium-coated Quartz)

Silicon Dioxide (SiO2) with metallic vapor coating

Concrete

Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)

Weathered concrete or cementitious slab (not natural rock)

Artificial calcium-silicate cement composite; likely Portland cement concrete

Blue Obsidian

Volcanic Glass (Silica, SiO2)

Diamond (or Simulant)

Carbon (C)

Opalite

Synthetic Opalite Glass

Titanium Aura Quartz

Titanium bonded Silicon Dioxide (SiO2 + Ti)