Man Made Rock (Sedimentary Analogue)

Metal Alloy (Likely Pewter or Sterling Silver)

Not a natural geological specimen; composed of refined metals. If pewter, it's a tin-based alloy. If sterling silver, it's 92.5% silver and 7.5% other metals (usually copper).

Opalite

Synthetic Glass (Simulated Opal)

Synthetic Resin / Plastic Figurine

Synthetic Polymer (Copolymer of Polyethylene or Resin)

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Byproduct)

Aura Quartz

Titanium or Gold bonded Silicon Dioxide (SiO2)

Moqui Marble (Ironstone Concretion)

Goethite/Hematite Concretion (Fe2O3 / FeO(OH))

Concrete

Hydrated Portland Cement Aggregate Composite

Dalmatian jasper

Porphyritic microcrystalline quartz-rich rock, commonly sold as Dalmatian jasper; spots are chiefly arfvedsonite/amphibole minerals, sometimes altered feldspar

Aura Quartz (specifically Titanium Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti Coating)

Beads (likely glass or man-made material)

N/A (artificial material)

Quartz crystal (likely clear quartz)

Quartz, silicon dioxide (SiO₂)

Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Opalite

Synthetic Opalized Glass

Opalite (Synthetic Moonstone/Opal)

Synthetic Silica Glass

Aluminum Slag

Anthropogenic Aluminum (Al)

Carborundum (Silicon Carbide)

Silicon Carbide (SiC) / Moissanite (natural form)

Rock crystal (clear quartz), possibly cloudy quartz

Quartz, silicon dioxide (SiO₂)

Small brown mineral/rock fragment

Uncertain; possibly iron-oxide-stained quartz, jasper, or a weathered ironstone fragment

Sea Glass (specifically Frosted White)

Amorphous Silica (substance: Sodium-calcium silicate glass)

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Asphalt Chunk

Asphalt concrete

Quartz crystal fragment (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Tumbled black stone, likely black obsidian

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

Tumbled gray stone, likely quartz-rich pebble

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

Opalite Egg

Synthetic Glass (Simulated Opal)

Opalite

Opalescent Glass (SiO2 + coloring agents)

Green Aventurine

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

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)

Blue Slag Glass

Anthropogenic Amorphous Silicon Dioxide

Blue glassy gemstone-like specimen

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

Sea Glass

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

Goldstone (brown goldstone)

Man-made aventurine glass, typically copper-bearing silica glass

Blue Goldstone

Synthetic glass with cobalt and copper inclusions

Cubic Zirconia (Jewelry Setting)

Cubic Zirconia (ZrO2)

Aluminum Slag

Anthropogenic Aluminum (Al)

Cullet (Slag Glass)

Amorphous Silica (SiO2) with various metal oxide colorants

Smelter Slag

Anthropogenic Silicate Slag

Hematite

Iron(III) oxide (Fe2O3)

Titanium Aura Quartz

Silicon Dioxide (SiO2) coated with Titanium and Niobium