Antropogenic (Man Made Glass Byproduct)

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)

Green Aventurine

Quartz (SiO2) with Fuchsite inclusions

Rough Diamond

Native Carbon (C)

Sea Glass (Cobalt Blue)

Amorphous Silica (Glass with Cobalt additives)

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

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

Quartz, silicon dioxide (SiO₂)

Efflorescence (on Clay Brick)

Crystalline salt deposits (typically Sodium Sulfate Na2SO4, Calcium Carbonate CaCO3, or Potassium Sulfate K2SO4)

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Blue Goldstone

Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)

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

Chert (specifically Tan/Gray Chert)

Microcrystalline quartz (SiO2)

Fired Clay Brick (Anthropic Rock substitute)

Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)

Likely beach-worn glass and a pebble

The brown piece appears to be weathered glass (amorphous SiO₂-rich material); the pale piece is likely a small quartz-rich stone, possibly milky quartz.

Goldstone and pink quartz bead strands

Goldstone is aventurescent copper-bearing glass; pink beads are likely rose quartz (SiO₂), though dyed or glass imitations are possible

Sea Glass

Amorphous Silica (Glass) SiO2

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Blue glassy cabochon, likely blue quartz or synthetic glass

Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive

Likely milky quartz fragment

Quartz (SiO₂)

Tumbled orange-and-white feldspar-rich stone, likely sunstone or orange feldspar

Likely potassium feldspar (orthoclase or microcline), KAlSi₃O₈; exact identification is uncertain from the image

Quartz Pebble

Silicon Dioxide (SiO2)

Nickel coin (U.S. currency)

Cupronickel (75% Copper, 25% Nickel alloy)

Red glass-like crystal, likely synthetic ruby or red glass

Uncertain from image; possible corundum (ruby), Al₂O₃, or synthetic glass

Beaded gemstone bracelet

Indeterminate; likely small polished mineral beads, possibly turquoise or dyed stone, with metal and glass components

Obsidian

Volcanic glass (SiO2)

Green Aventurine

Silicon Dioxide (SiO2+KAl2(AlSi3O10)(OH)2)