Mineral (Man Made Glass)

Slag Glass

Anthropogenic Amorphous Silicon Dioxide

Black tumbled stone, possibly obsidian

Obsidian (volcanic glass; predominantly SiO₂), identification uncertain from image

Clear quartz sphere

Quartz (silicon dioxide, SiO₂)

Terrazzo (Man-made Composite)

Cementitious or Resin-bound Lithic Composite

Asphalt Concrete

Bituminous conglomerate

Opalite

Synthetically produced glass (Silicon Dioxide with metallic inclusions)

Opalite

Man-made opalescent glass (SiO2 + metal oxides)

Tumbled clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Likely clear quartz pebble or glassy quartz fragment

Quartz (silicon dioxide, SiO₂)

Clear quartz tumbled stone

Quartz (silicon dioxide, SiO₂)

Tumbled gray stone, likely quartz-rich pebble

Probable microcrystalline quartz/chalcedony (SiO₂), possibly gray jasper or quartzite

Moldavite

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

Green sea glass (likely bottle glass)

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

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Blue Diamond

Carbon with Boron impurities (C)

Blue Goldstone

Auraventurine (Synthetic glass with cobalt and copper inclusions)

Diamond (or Simulant)

Carbon (C) or relevant simulant formula (e.g., ZrO2 for Cubic Zirconia)

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite or Goethite inclusions

Sea Glass

Man-made vitreous material (silica glass)

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Green sea glass or tumbled green quartz (uncertain)

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

Sea Glass

Man-made silicate glass (Amorphous silicon dioxide)

Asphalt (Road Aggregate)

Bituminous conglomerate

Opalite

Synthetic opalescent glass

Clear quartz fragment (rock crystal)

Quartz, silicon dioxide (SiO₂)

Opalite

Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)

Blue Obsidian (Cullet Glass)

Silicon Dioxide (Amorphous Glass)

Mystic Topaz (Treated Quartz or Topaz)

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

Opalite (likely man-made opalescent glass)

Opalite; not a true mineral, typically synthetic opalescent glass (silica-based)

Goldstone

Man-made glass infused with metallic copper

Pyrite in Quartz (Drill Core)

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

Sea Glass

Man-made silicate glass weathering product

Small greenish crystal/mineral fragment

Indeterminate; possibly olivine, quartz, or a green gemstone fragment

Concrete Fragment

Hardened Portland cement and mineral aggregate

Black glassy fragment, likely obsidian or industrial glass

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

Opalite

Synthetic Opalized Glass (SiO2 + additives)

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.

Asphalt Concrete (Bituminous Conglomerate)

Anthropogenic Bituminous Conglomerate

Opalite (Man-made Glass)

Fused glass (typically made of dolomite and metal opacifiers)

Decorative mosaic cross containing mixed rock and glass fragments

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

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial byproduct)

Rock crystal (clear quartz), possibly cloudy quartz

Quartz, silicon dioxide (SiO₂)