Man Made (Synthetic Rock)

Green glass sphere/marble

Soda-lime glass (primarily SiO2, Na2O, CaO)

Blue Obsidian (Cullet Glass)

Silicon Dioxide (Amorphous Glass)

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).

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Byproduct)

Aura Quartz

Titanium or Gold bonded Silicon Dioxide (SiO2)

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)

Goldstone (Red)

Aventurine Glass (SiO2 + Cu)

Beads (likely glass or man-made material)

N/A (artificial material)

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) with polymer resins

Aluminum Slag

Anthropogenic Aluminum (Al)

Carborundum (Silicon Carbide)

Silicon Carbide (SiC) / Moissanite (natural form)

Blue Goldstone

Aventurine Glass (SiO2 with Cobalt/Copper inclusions)

Colorless quartz crystal (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Rock crystal (clear quartz), possibly cloudy quartz

Quartz, silicon dioxide (SiO₂)

Sea Glass (specifically Frosted White)

Amorphous Silica (substance: Sodium-calcium silicate glass)

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Chert (Chalky Flint Node)

Chert (Microcrystalline Quartz, SiO2)

Asphalt Chunk

Asphalt concrete

Likely clear quartz crystal (possibly cut/polished quartz or glass imitation)

Quartz, silicon dioxide (SiO₂)

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

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)

Rainbow Hematite Ring

Iron(III) oxide (Fe2O3) with thin-film coating

Concrete with Aggregate

Artificial Conglomerate (Cement and Aggregate)

Faceted gemstone in a jewelry setting

Indeterminate from image; likely quartz, cubic zirconia, or another transparent faceted stone

Polymictic conglomerate or breccia (possibly concrete-like aggregate)

Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates

Unidentified polished dark gemstone cabochon

Possibly hematite, obsidian, jet, or dark agate; image insufficient for a definitive identification

Green Aventurine

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

Goldstone

Avventurina (Cu + SiO2 glass)

Blue Goldstone

Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)

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

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

Smelter Slag

Anthropogenic Silicate Slag

Aluminum Slag

Anthropogenic Aluminum (Al)

Cullet (Slag Glass)

Amorphous Silica (SiO2) with various metal oxide colorants

Diamond (or Diamond Simulant)

Carbon (C) or Cubic Zirconia (ZrO2)