Man Made Glass (Not A Natural Rock Or Mineral)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

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

Opalite (Synthetic Moonstone/Sea Opal)

Silicon Dioxide (SiO2) glass with metallic inclusions

Quartzite (Engineered Stone)

Silicon Dioxide (SiO2) based synthetic composite

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

Baked-clay ceramic fragment (likely brick or pottery)

Fired clay, primarily aluminosilicate minerals; not a natural rock

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)

Opalite

Synthetic opalescent glass

Aluminum Slag

Anthropogenic Aluminum (Al)

Blue tumbled glass-like specimen; likely blue slag glass

Likely man-made glass (silicate glass), not a natural mineral; exact material cannot be confirmed from the image

Sea Glass

Man-made silicate glass

Sandstone Anvil / Nutting Stone

Quartzose Sandstone (Sedimentary Rock)

Aura Quartz

Titanium or Gold bonded Silicon Dioxide (SiO2)

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)

Sea Glass

Man-made silicate glass

Polymer Clay (Mock Mineral)

Polyvinyl chloride (PVC) with plasticizers and pigment

Sea Glass

Man-made silicate glass

Milky quartz

Quartz (silicon dioxide, SiO₂)

Asphalt (Bituminous Concrete)

Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)

Man-made Glass (Tumbled/Shaped)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Sea Glass

Silicon dioxide (mostly)

Goldstone (Red)

Aventurine Glass (SiO2 + Cu)

Blue cabochon, likely dyed or synthetic material

Undetermined; possibly dyed chalcedony (SiO₂), glass, or synthetic corundum

Titanium Aura Quartz

Silicon Dioxide (SiO2) coated with Titanium and Niobium

Crackle Agate / Dyed Quartz

SiO2 (Silicon Dioxide)

Aqua Aura Quartz

Titanium/Gold-coated Silicon Dioxide (SiO2)

Blue obsidian-like volcanic glass

Volcanic glass, chiefly silica-rich amorphous material (composition uncertain)

Blue-dyed tumbled quartz or glass imitation

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

Blue Sapphire (Synthetic or Man-made Glass Imitation)

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

Slag Glass

Anthropogenic Amorphous Silicon Dioxide

Dyed Imperial Jasper (Sea Sediment Jasper)

Silicon Dioxide (SiO2) - Impure Quartz/Chalcedony

Blue sea glass or blue glassy mineral fragment

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