Tektite (Natural Glass)

Quartz Pebble

Silicon Dioxide (SiO2)

Rounded quartz-rich pebble, likely sandstone or granitic-derived pebble

Indeterminate clastic rock; likely quartz-rich sandstone/conglomerate clast

Banded Chert / Chalcedony

Silicon Dioxide (SiO2)

Decorative gemstone bracelet or jewelry

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

Yellow Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2) with trace aluminum and irradiation

Polished silver sheen obsidian heart

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

Diamond (Cut Specimen)

Diamond (pure carbon, C)

Polished blue stone, likely sodalite or dyed agate

Most consistent with sodalite (Na₈(Al₆Si₆O₂₄)Cl₂), though the image cannot confirm composition

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Citrine (Heat-treated)

Silicon Dioxide (SiO2)

Polished black stone, likely black obsidian

Obsidian, volcanic glass; primarily silica-rich SiO₂ with minor feldspar, iron, and magnesium

Polished black star-shaped stone, likely black obsidian

Obsidian (volcanic glass), primarily SiO₂

Polished black stone, likely obsidian

Volcanic glass (obsidian), primarily silica-rich amorphous SiO₂

Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Green Aventurine

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

Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Tumbled amethyst (tentative)

Quartz, SiO₂; purple variety colored mainly by iron-related defects and irradiation

Rough Green Adventurine

Aventurine (Variety of Quartz, SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Fuscite inclusions

Green Aventurine

Silicon dioxide (SiO2) with inclusions of Fuchsite mica

Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Black Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Blue resin-coated or dyed stone cabochon

Likely dyed chalcedony/agate (microcrystalline quartz, SiO₂); exact material is uncertain from the image

Polished blue-black cabochon, likely blue obsidian or dyed glass-like stone

Indeterminate from image; possible natural obsidian (volcanic glass), commonly SiO₂-rich rhyolitic glass

Tumbled pale-yellow quartz (likely citrine or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Yellow chalcedony (likely tumbled citrine or yellow jasper)

Microcrystalline quartz, SiO₂; exact variety is uncertain from the image

Blue Slag Glass

Ferro-silicate glass (Slag)

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Amethyst on Basalt Matrix

Crystalline Silicon Dioxide (SiO2) with iron impurities

Smoky Quartz

Silicon Dioxide (SiO2)

Citrine

Silicon dioxide (SiO2)

Chert / Flint Nodule

Microcrystalline quartz (SiO2)

Diamond (or Diamond Simulant)

Carbon (C) or Cubic Zirconia (ZrO2)

Tumbled pink chalcedony (likely rose quartz or pink agate)

Chalcedony, microcrystalline quartz (SiO₂); exact variety is uncertain from the image

Green Aventurine

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

Citrine

SiO2 (Silicon Dioxide)

Polished dark stone, likely obsidian

Volcanic glass; primarily SiO₂

Goldstone (likely blue-free synthetic goldstone pendant)

Synthetic aventurine glass; silica glass with dispersed metallic copper crystals

Obsidian

Volcanic Glass (SiO2)