Man Made Glass

Sea Glass

Amorphous Silicon Dioxide (SiO2)

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Blue glass-like bead or gemstone keychain ornament

Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)

Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)

Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)

Silicon Dioxide (SiO2) with metallic inclusions

Likely blue glass or synthetic gemstone jewelry

Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass

Porcelain (Stoneware Ceramic)

Mullite / Silica-glass composite (Al6Si2O13)

Sea Glass

Anthropogenic Silicate Glass

Blue Slag Glass

Amorphous Silica (Byproduct of smelting)

Slag (Anthropogenic Glass/Iron byproduct)

Ferro-silicate Slag

Green Glass Slag

Amorphous Silicon Dioxide (SiO2) with metal oxide impurities

Brick

Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)

Clear-stone silver-tone teardrop earring

The stones may be colorless quartz or glass; the image does not allow reliable identification. Metal setting appears silver-tone.

Likely rough green-blue glassy mineral fragment

Unidentified; the image is insufficient to distinguish a natural mineral from industrial slag or glass

Orange glassy slag (industrial by-product)

Iron-rich silicate glass; composition varies, commonly Fe–Ca–Al silicate

Likely green bottle glass, not a geological specimen

Manufactured soda-lime silicate glass

Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia)

Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Red cabochon gemstone ring (likely glass or synthetic stone)

Undetermined; the image does not establish a natural mineral identity

Black Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Blue tumbled glass or dyed stone (uncertain)

Unidentified; appearance is consistent with blue glass, but a blue mineral such as dyed quartz cannot be ruled out from the photo

Chert (flint), likely a weathered nodule fragment

Microcrystalline quartz (SiO₂), commonly termed chert or flint

Sea Glass

Amorphous silicon dioxide (glass)

Rough Diamond

Native Carbon (C)

Tumbled quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Colorless faceted gemstone, likely glass or quartz

Uncertain; possibly quartz (SiO₂), but the strong uniform brilliance and apparent molded/faceted form may indicate leaded glass or cubic zirconia

Brown chert (flint)

Microcrystalline quartz (SiO₂), commonly called chert; “flint” is a dark variety

Metal Chain (Likely Steel or a Steel Alloy)

Steel (primarily iron and carbon); specific alloy unknown

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

Quartz, silicon dioxide (SiO₂)

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Gem-set gold ring

Unidentified transparent gemstone, possibly quartz or glass, set in a gold-colored metal ring

White drusy quartz

Quartz, silicon dioxide (SiO₂), with a drusy coating of tiny crystals

Milky quartz (rough fragment)

Quartz, silicon dioxide (SiO₂)

Corundum (Pink Sapphire / Ruby)

Al2O3 (Aluminum Oxide)

Orange tumbled feldspar, likely sunstone

Probably potassium feldspar (orthoclase or microcline); identification is uncertain from the image

Obsidian

Volcanic Glass (70% or more SiO2)

Faceted colorless gemstone, likely quartz or glass imitation

Most likely quartz (SiO₂), though the strong glare and visible facet pattern could indicate cubic zirconia or lead glass

Sea Glass (Cobalt Blue)

Amorphous Silica (Glass with Cobalt additives)

Chert (specifically Tan/Gray Chert)

Microcrystalline quartz (SiO2)