Mineral (Man Made Glass, Not Natural)

Crackle Agate / Dyed Quartz

SiO2 (Silicon Dioxide)

Sea Glass

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

Concrete Paver (Artificial Cementitious Rock)

Hydrated Portland Cement Aggregate

Aqua Aura Quartz

Titanium/Gold-coated Silicon Dioxide (SiO2)

Green Sea Glass

Man-made vitreous material (silica glass)

Goldstone (Red)

Aventurine Glass (SiO2 + Cu)

Dyed Imperial Jasper (Sea Sediment Jasper)

Silicon Dioxide (SiO2) - Impure Quartz/Chalcedony

Engineerged Quartz (Quartz Composite)

SiO2 (Silicon Dioxide) in a polymer resin matrix

Goldstone (likely red/brown aventurine glass)

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

Concrete

Anthropogenic Conglomerate

Blue-dyed tumbled quartz or glass imitation

Quartz (SiO₂), appearance possibly enhanced with blue dye; identity uncertain from image

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Slag Glass

Anthropogenic Amorphous Silicon Dioxide

Polished black pebble, possibly obsidian

Volcanic glass (obsidian), likely; identification is tentative from the image

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial byproduct)

Man-made Glass (Tumbled/Shaped)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Sea Glass

Silicon dioxide (mostly)

Cherry Quartz

SiO2 (Silicon Dioxide with iron-rich inclusions/dye)

Green sea glass (likely slag glass or bottle glass)

Man-made soda-lime silicate glass; not a naturally occurring mineral

Dyed or synthetic turquoise-blue glass-like specimen

Likely man-made colored glass or resin; exact identification requires testing

Black Obsidian

Amorphous volcanic glass (SiO2 + impurities)

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Polished black pebble, likely basalt

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, commonly with olivine

Diamond

Native Carbon (C)

Crackled Quartz (Dyed)

Silicon Dioxide (SiO2)

Libyan Desert Glass

Libyan Desert Glass (SiO2 with trace elements)

Opalite

Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)

Asphalt Concrete

Bituminous Concrete

Obsidian (Blue)

Volcanic Glass (SiO2)

Blue Sapphire (Synthetic or Man-made Glass Imitation)

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

Blue sea glass or blue glassy mineral fragment

Uncertain; likely man-made soda-lime glass, not a natural mineral

Green obsidian (likely molded or heat-treated glass-like specimen)

Volcanic glass; predominantly rhyolitic composition (silica-rich amorphous SiO₂)

Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Blue glassy fragment among beach gravel

Likely cobalt-blue man-made glass; not a natural mineral specimen

Rock crystal quartz fragments

Quartz (silicon dioxide, SiO₂)

Chakra Stone Tower (Composite Multi-Mineral)

Crystalline Silicon Dioxide composite (SiO2) with various inclusions

Opalite

Synthetic Opalised Glass

Green Glass (often marketed as 'Obsidian' or 'Green Quartz')

Amorphous Silica (SiO2) with copper or chromium additives

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

Blue goldstone

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

Blue glassy tumbled stone, likely blue chalcedony or slag glass

Chalcedony (microcrystalline SiO₂), possibly man-made blue glass

Mystic Topaz

Aluminum Silicate Fluoride Hydroxide (Al2SiO4(F,OH)2) with metallic film coating