Mineral (Man Made Glass, Not Natural)

Purple glassy pebble, possibly slag glass

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

Green glass-like mineral specimen, likely fluorite

Fluorite (calcium fluoride, CaF₂), if natural; appearance may also indicate colored glass

Green sea glass (likely bottle glass)

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

Aura Quartz (Titanium-coated Quartz)

Silicon Dioxide (SiO2) with metallic vapor coating

Likely iron-rich slag or weathered ironstone fragment

Uncertain; possibly iron oxide–rich material (hematite/goethite) or industrial iron slag

Opalite

Man-made Glass (Synthetic Opalized Glass)

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Quartz (likely milky quartz or quartz glass-like fragment)

Quartz, silicon dioxide (SiO₂)

Opalite

Man-made opalescent glass (SiO2 + metal oxides)

Goldstone (Red)

Aventurine Glass (Cupriferous glass)

Diamond (or Simulant)

Carbon (C)

Titanium Aura Quartz

Titanium bonded Silicon Dioxide (SiO2 + Ti)

Aura Quartz (Titanium Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti)

Opalite-style pendant (likely synthetic glass, not natural opal)

Opalescent glass; commonly sold as “opalite” (not a recognized mineral species)

Tumbled clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Asphalt Concrete

Bituminous conglomerate

Opalite

Synthetic Glass (Amorphized Silicon Dioxide)

Clear quartz tumbled stone

Quartz (silicon dioxide, SiO₂)

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite or Goethite inclusions

Likely clear quartz pebble or glassy quartz fragment

Quartz (silicon dioxide, SiO₂)

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Black glassy fragment, likely obsidian or industrial glass

Volcanic glass (obsidian), chiefly amorphous SiO₂; identification uncertain from image

Asphalt (Road Aggregate)

Asphalt concrete / Bituminous mixture

Opalite (Synthetic Moonstone/Sea Opal)

Silicon Dioxide (SiO2) glass with metallic inclusions

Blue glassy-looking specimen, possibly dyed or coated mineral

Not identifiable from the photograph; possibilities include dyed quartz or glassy slag, but composition cannot be established visually.

Green sea glass or tumbled green quartz (uncertain)

Likely quartz (SiO₂) if natural; alternatively man-made soda-lime glass

Sea Glass

Amorphous silicon dioxide (SiO2) - Man-made glass tumbled by nature

Aura Quartz (Rainbow Quartz)

Silicon Dioxide (SiO2) with metallic vapor coatings

Sea Glass

Amorphous Silicon Dioxide (Man-made glass weathered by nature)

Green Sea Glass

Man-made vitreous material (silica glass)

Cherry Quartz with Rose Quartz

Crystalline Quartz (SiO2) with glass-based synthetic components

Goldstone (Brown)

Aventurine Glass (Silicon Dioxide infused with Copper crystals)

Aluminum Slag

Anthropogenic Aluminum (Al)

Opalite

Synthetic opalescent glass

Sea Glass

Man-made silicate glass

Goldstone (likely red/brown aventurine glass)

Man-made aventurine glass; copper-bearing silicate glass (not a natural mineral)

Aura Quartz

Titanium or Gold bonded Silicon Dioxide (SiO2)

Decorative mosaic cross containing mixed rock and glass fragments

Polychrome aggregate; likely quartz, feldspar, marble, granite, and assorted colored glass

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Sea Glass

Amorphous silicon dioxide

Sea Glass

Man-made silicate glass

Aura Quartz (specifically Titanium Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti Coating)