Tektite (Natural Glass)

Aura Quartz (Titanium/Rainbow Quartz)

SiO2 (Silicon Dioxide) with metallic coating

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Byproduct)

Green faceted gemstone, likely synthetic glass or peridot

Indeterminate from image; possible peridot (olivine, (Mg,Fe)₂SiO₄) or green synthetic glass

Black onyx or black obsidian bead bracelet

Likely black chalcedony (microcrystalline quartz, SiO₂); possibly volcanic glass (obsidian, SiO₂)

Black obsidian (probable)

Volcanic glass; primarily SiO₂-rich rhyolitic composition

Obsidian

Volcanic Glass

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Likely quartz-rich rock fragment

Quartz (SiO₂), possibly a fragment of quartzite or silica-rich slag

Goldstone (Red)

Aventurine Glass (SiO2 + Cu)

Small clear crystal, possibly quartz or glass-like gemstone

Uncertain; likely quartz (SiO₂), but the image is insufficient to exclude man-made glass or cubic zirconia

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant

Citrine

Citrine (Silicon Dioxide, SiO2)

Tumbled mahogany obsidian

Volcanic glass, predominantly rhyolitic silica (SiO₂), with iron-oxide inclusions

Yellow Quartz / Citrine Quartz

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2)

Opalite

Man-made opalescent glass (SiO2 + metal oxides)

Opalite crescent pendant

Opalite (man-made opalescent glass; not a natural mineral)

Sandstone

Arenite (SiO2 based typically)

Red cabochon gemstone ring (likely glass or synthetic stone)

Undetermined; the image does not establish a natural mineral identity

Polished carnelian chalcedony

Carnelian, a red-orange variety of microcrystalline quartz (SiO₂)

Green gemstone ring, likely emerald simulant or jade

Uncertain; possible beryl (emerald, Be₃Al₂Si₆O₁₈) or jadeite (NaAlSi₂O₆), but the blurred image may show synthetic glass or another treated stone

Gold-colored gemstone ring, likely citrine or glass imitation

Indeterminate from image; possible quartz (SiO₂) or yellow glass set in gold-colored metal

Clear Quartz (faceted) / Diamond Simulant

Silicon Dioxide (SiO2) / Cubic Zirconia (ZrO2)

Opalite

Synthetic Glass (Simulated Opal)

Red jasper (possible polished or dyed stone)

Jasper, an opaque microcrystalline variety of quartz (SiO₂)

Red gemstone ring, likely synthetic ruby or red spinel

Ruby: corundum (Al₂O₃); spinel: MgAl₂O₄; exact identity requires testing

Goldstone (Brown)

Aventurine Glass (Silicon Dioxide infused with Copper crystals)

Yellow Quartz (Citrine Quartzite)

Silicon Dioxide (SiO2)

Citrine

Citrine (Silicon Dioxide - SiO2)

Snowflake obsidian cabochon

Obsidian (volcanic glass), SiO₂-rich; white areas are cristobalite/spherulitic devitrification

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Raw Citrine

Citrine (Silicon Dioxide - SiO2)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Polished mahogany obsidian

Volcanic glass; rhyolitic obsidian, commonly with iron-oxide coloration

Obsidian (likely)

Volcanic glass, predominantly silica-rich rhyolitic composition (no fixed mineral formula)

Obsidian

Volcanic Glass (Amorphous silicon dioxide with impurities)

Green glass cabochon or tumbled stone

Indeterminate; likely man-made glass, possibly aventurine glass rather than a natural mineral

Red faceted gemstone, likely synthetic ruby or red glass

Ruby: corundum, aluminum oxide (Al₂O₃), chromium-colored; identity cannot be confirmed visually

Citrine Quartz

Silicon Dioxide (SiO2)

Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)

N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities