Man Made Alloy (Metallic)

Possible weathered basalt or slag fragment

Basalt, chiefly plagioclase and pyroxene; identification is uncertain from the image

Opalite

Synthetic Opalized Glass

Opalite

Synthetic Glass (Amorphized Silicon Dioxide)

Asphalt Concrete (Bituminous Pavement)

Aggregates in Bitumen Matrix

Opalite (Synthetic Moonstone/Opal)

Synthetic Silica Glass

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) with polymer resins

Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Black beaded bracelet, likely black onyx or glass

Possibly chalcedony (microcrystalline quartz, SiO₂); the beads may instead be man-made glass

Blue goldstone beads

Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli

United States Quarter Dollar

Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)

Tumbled Clear Quartz/Rock Crystal

Silicon Dioxide (SiO2)

Opalite

Man-made Glass (Synthetic Opalized Glass)

Asphalt Concrete

Bituminous Concrete (Anthropic Rock)

Chert (Chalky Flint Node)

Chert (Microcrystalline Quartz, SiO2)

Concrete fragment with Aggregate

Anthropogenic Concrete with Calcarious and Siliceous Aggregate

Opalite Egg

Synthetic Glass (Simulated Opal)

Polymer Clay (Mock Mineral)

Polyvinyl chloride (PVC) with plasticizers and pigment

Concrete with Aggregate

Artificial Conglomerate (Cement and Aggregate)

Opalite

Opalescent Glass (SiO2 + coloring agents)

Milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Tumbled black stone, likely black obsidian

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

Concrete / Anthropogenic Conglomerate

Man-made composite material (Portland cement, aggregate, and water)

Native gold (small nugget or grain)

Native gold, Au

Blue glassy gemstone-like specimen

Indeterminate; possibly dyed or treated turquoise, blue apatite, or man-made glass

White pebble, likely quartz or calcite

Indeterminate from image; possible microcrystalline quartz (SiO₂) or calcite (CaCO₃)

Polished blue glassy mineral specimen, likely sodalite or blue aventurine

Most consistent with sodalite (Na₈Al₆Si₆O₂₄Cl₂), though dyed quartzite or blue glass cannot be excluded from the photograph

Cubic Zirconia (Jewelry Setting)

Zirconium Dioxide (ZrO2)

Diamond

Native Carbon (C)

Conglomerate

Conglomerate (clastic sedimentary rock)

Blue Slag Glass

Anthropogenic Amorphous Silicon Dioxide

Sea Glass

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

Red glassy gemstone, possibly garnet

Unidentified red transparent material; garnet group (X₃Y₂(SiO₄)₃) is a possibility

Cubic Zirconia (Jewelry Setting)

Cubic Zirconia (ZrO2)

Dzi Bead (Etched Chalcedony)

Cryptocrystalline Quartz (SiO2) with chemical etching

Cullet (Slag Glass)

Amorphous Silica (SiO2) with various metal oxide colorants

Dragon's Breath (Mexican Opal Glass)

Artisan Foil Glass (SiO2 based)

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

Goldstone (blue/black aventurine glass)

Man-made aventurine glass; silica glass containing metallic copper or other glittering inclusions

Milky quartz

Quartz (silicon dioxide, SiO₂)

Concrete rubble

Anthropogenic conglomerate

Lava Rock with Fabric Impression

Scoria or Basalt with anthropogenic impressions

Sea Glass

Man-made silicate glass (Amorphous silicon dioxide)