Mineral (Man Made Glass)

Sandstone

Arenite (specifically sublithic or quartz arenite)

Chalk

Calcium Carbonate (CaCO3)

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Tumbled chalcedony or quartz pebble

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

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

Quartz (likely Chalcedony or Chert)

Silicon Dioxide (SiO2)

Sandstone

Arenite (variable SiO2 composition)

Tumbled obsidian

Volcanic glass; chiefly SiO₂, noncrystalline

Moissanite

Silicon Carbide (SiC)

Diamond

Carbon (C)

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Diamond

Carbon (C)

Jasper / Chert (Red)

Cryptocrystalline quartz (SiO2)

Green Slag Glass

Amorphous Silica / Glassy Blast Furnace Slag

White quartz bead bracelet (likely milky quartz)

Quartz, silicon dioxide (SiO₂), usually microcrystalline or cloudy crystalline quartz

Beach Pebble (Chalcedony / Chert)

Silicon Dioxide (SiO2)

Botryoidal chalcedony with iron-oxide staining

Microcrystalline quartz (SiO₂), likely iron-oxide-bearing chalcedony

Diamond

Carbon (C)

Diamond (Colorless/White)

Carbon (C)

Sandstone

Sedimentary Rock (Quartz arenite)

Pumice

Pumice (Vesicular volcanic glass)

Sandstone (likely Quartzose Sandstone)

Arenite

Obsidian

Volcanic Glass (70% or more SiO2)

Turquoise-style beaded bracelet

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly dyed or composite beads

Tumbled amethyst quartz

Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation

Decorative gemstone-chip jewelry (likely turquoise, coral, and assorted beads)

Predominantly turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; other pieces appear to be dyed coral or red stone, and possibly shell/metal components

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Flint

Silicon dioxide (SiO2)

Obsidian (Black)

Obsidian (High-silica volcanic glass)

Beaded gemstone bracelet, likely lapis lazuli and pale quartz/agate

Lapis lazuli: lazurite-rich rock, chiefly (Na,Ca)₈(AlSiO₄)₆(S,SO)₂; pale beads are uncertain

Quartz (Microcrystalline/Chert)

Silicon Dioxide (SiO2)

Tumbled chalcedony (likely milky quartz)

Microcrystalline quartz, SiO₂; possibly pale agate or quartzite

Smoky Quartz

Silicon Dioxide (SiO2)

Probable amber fragment

Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)

Diamond

Carbon (C)

Diamond (in a jewelry setting)

Carbon (C)

Granite

Phaneritic Felsic Igneous Rock

Diamond (or Diamond Simulant)

Carbon (C) or Cubic Zirconia (ZrO2)

Red-and-white jasper/chalcedony pebble

Microcrystalline quartz (SiO₂), likely hematite- or iron-oxide-bearing jasper with white chalcedony/quartz

Decorative gemstone bracelet or jewelry

Unidentifiable from the blurred image; likely colored glass or synthetic stones, possibly mixed gemstone beads

Cullet Glass (Industrial Slag Glass)

Amorphous Silica (SiO2) with metallic oxide impurities