Antropogenic (Man Made Glass Byproduct)

Green glass sphere/marble

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

Goldstone beads (likely brown goldstone)

Man-made copper-bearing glass; not a natural mineral. Often sold as “aventurine glass.”

Opalite

Man-made Synthetic Glass (Silicon Dioxide with metal additives)

Sea Glass

Amorphous silicon dioxide (SiO2) - Man-made glass tumbled by nature

Polished labradorite sphere

Labradorite, calcic plagioclase feldspar ((Ca,Na)(Al,Si)₄O₈)

Green Aventurine

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

Opalite

Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)

Blue Glass / Slag Glass

Amorphous silicon dioxide (SiO2) with cobalt colorants

Transit Token (RTD Denver)

Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)

Blue Goldstone

Synthetic Avanturine Glass (or Aventurine Glass)

Polished white chalcedony or quartz pendant

Microcrystalline quartz (chalcedony), SiO₂; exact identification is uncertain from the image

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

Small greenish crystal/mineral fragment

Indeterminate; possibly olivine, quartz, or a green gemstone fragment

Pyrite in Quartz (Drill Core)

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

Blue obsidian-like volcanic glass

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

Milky quartz (likely quartz crystal fragment)

Quartz, silicon dioxide (SiO₂)

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 (likely bottle glass)

Man-made soda-lime silicate glass; not a natural mineral

Rock crystal quartz fragments

Quartz (silicon dioxide, SiO₂)

Opalite

Synthetic Opalised Glass

Asphalt (Road Aggregate)

Bituminous conglomerate

Green obsidian (likely molded or heat-treated glass-like specimen)

Volcanic glass; predominantly rhyolitic composition (silica-rich amorphous SiO₂)

Crushed Stone (Likely Limestone or Granite)

Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite

Opalite

Synthetic Opalite Glass (Silicon Dioxide)

Mystic Topaz (Treated Quartz or Topaz)

Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2] with thin-film metallic coating

Sandstone Concretion

Limonitic Sandstone Concretion

Polished silver sheen obsidian heart

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

Polished labradorite pendant

Labradorite, a calcium-rich plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)

Citrine Quartz

Citrine (Silicon Dioxide, SiO2)

Opalite

Synthetic glass (SiO2 + metal additions)

Aura Quartz (Rainbow Quartz)

Silicon Dioxide (SiO2) with metallic vapor coatings

Sea Glass

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

Colorless quartz crystal (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Concrete Paver (Artificial Cementitious Rock)

Hydrated Portland Cement Aggregate

Unidentifiable Rock Fragment

Man-made Jewelry (Metal and Glass/Plastic)

Synthetic Alloy and Amorphous Solid (SiO2/Polymer)

Sea Glass

Amorphous Silicon Dioxide (Man-made glass weathered by nature)

Chert Arrowhead (Projectile Point)

Microcrystalline Quartz (Chert or Flint)

Blue Goldstone

Goldstone (artificial glass)

Red goldstone beads

Goldstone (man-made copper-bearing glass; not a natural mineral)

Goldstone (brown goldstone)

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

Faceted clear gemstone, likely quartz or glass imitation

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