Man Made Silicate (Anthropogenic Glass)

Citrine Quartz

Citrine (Silicon Dioxide, SiO2)

Concrete Paver (Artificial Cementitious Rock)

Hydrated Portland Cement Aggregate

Unidentifiable Rock Fragment

Tektite

Impactite (Natural Silicate Glass)

Polished silver sheen obsidian heart

Obsidian (volcanic glass), primarily rhyolitic silica-rich glass

Colorless quartz crystal (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Titanium-coated Metal Cube (Man-made Fidget Toy)

Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)

Opalite

Synthetic Glass, SiO2 base with metallic inclusions

Blue Goldstone

Goldstone (artificial glass)

Man-made Jewelry (Metal and Glass/Plastic)

Synthetic Alloy and Amorphous Solid (SiO2/Polymer)

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Asphalt Concrete

Bituminous Concrete

Titanium Aura Quartz

Titanium bonded Silicon Dioxide (SiO2 + Ti)

Faceted clear gemstone, likely quartz or glass imitation

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

Sea Glass

Amorphous silicon dioxide (Man-made glass weathered by nature)

Chert Concretion

Chert (Microcrystalline Quartz, SiO2)

Blue Obsidian

Volcanic Glass (SiO2 with inclusions)

Aura Quartz (Titanium Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti)

Concretion (Sandstone)

Carbonate-cemented Sandstone Concretion

Opalite

Synthetic Opalised Glass

Polished brown jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions

Black Obsidian

Amorphous volcanic glass (SiO2 + impurities)

Tumbled milky chalcedony (likely common opalite-like quartz)

Chalcedony, microcrystalline SiO₂; possibly pale common opal, hydrated SiO₂·nH₂O

Blue opal heart cabochon

Common opal, hydrated amorphous silica (SiO₂·nH₂O), likely blue-dyed or synthetic opalite

Asphalt / Road Aggregate

Bituminous Conglomerate (synthetic)

Synthetic Resin / Plastic Figurine

Synthetic Polymer (Copolymer of Polyethylene or Resin)

Aura Quartz

Titanium or Gold bonded Silicon Dioxide (SiO2)

Bouncy Ball (Synthetic Rubber Polymer)

Polybutadiene / Ethylene Vinyl Acetate (EVA)

Goldstone (Red)

Aventurine Glass (SiO2 + Cu)

Polished dendritic agate or jasper

Microcrystalline quartz (SiO₂), likely chalcedony with iron/manganese dendrites

Blue-dyed tumbled quartz or glass imitation

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

Possible obsidian or slag glass

Volcanic glass, primarily SiO₂; alternatively industrial iron-rich glassy slag

Glass / Silicon Dioxide (Man-made)

SiO2 (Amorphous Silicon Dioxide)

Aura Quartz (specifically Titanium Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti Coating)

Libyan Desert Glass

Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)

Blue glassy tumbled stone, likely blue chalcedony or slag glass

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

Blue-green cabochon, likely chalcedony or treated glass imitation

Cryptocrystalline quartz (chalcedony/possibly chrysoprase); identification uncertain from image

Man-made Crystal (Lead Glass)

Lead oxide-doped Silica Glass (approx. SiO2 + PbO)

Sea glass (likely pale blue glass)

Human-made silicate glass, likely soda-lime glass; not a natural mineral or rock

Quartz crystal (likely clear quartz)

Quartz, silicon dioxide (SiO₂)

Polished black stone, likely black obsidian

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

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) with polymer resins