Man Made Byproduct (Non Geological)

Blue Sapphire (Ceylon)

Corundum (Al2O3) with traces of Iron and Titanium

Horse Chestnut (Buckeye seed)

Aesculus hippocastanum seed

Gold Sheen Obsidian

Volcanic Glass (SiO2 + Fe3O4 / Gas Inclusions)

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Rose Quartz (likely carved)

Rose Quartz (SiO2)

Obsidian

Obsidian (principally SiO2)

Quartzite

Quartzite (primarily SiO2)

Obsidian

Obsidian (Volcanic Glass, primarily SiO2)

Obsidian

Obsidian (Volcanic Glass)

Obsidian

Volcanic Glass (SiO2, usually >70% silica content)

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide)

Obsidian

Obsidian (principally SiO2 - Silicon Dioxide)

Obsidian

Volcanic Glass (predominantly SiO2)

Mixed Gemstone Beaded Jewelry

Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)

Quartz

Silicon Dioxide (SiO₂)

Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Obsidian

Volcanic Glass (SiO2 rich)

Obsidian

Volcanic glass (no mineral formula due to amorphous structure, mostly SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Mahogany Obsidian

Obsidian (Volcanic Glass) with Hematite/Magnetite inclusions

Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (70% or more silicon dioxide)

Quartz Vein in Schist

Quartz (SiO2) in Mica Schist

Obsidian

Volcanic Glass (predominantly SiO2, approximately 70% or more)

Jade (likely Nephrite Jade based on appearance)

Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Obsidian

Obsidian (volcanic glass), primarily SiO2 (silicon dioxide)

Chert (or Flint)

Chert (a cryptocrystalline variety of quartz, SiO2)

Apache Tears (Obsidian)

Volcanic Glass (SiO2 - Silicon Dioxide with impurities)

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Obsidian

Obsidian (principally SiO2)

Obsidian

Volcanic glass (high silica content, usually >70% SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Mahogany Obsidian

Obsidian (Volcanic Glass) with Hematite or Magnetite inclusions, SiO2 (Silicon Dioxide)

Tumbled Obsidian (possibly Mahogany Obsidian variant)

Volcanic Glass (Amorphous Silicon Dioxide, SiO2)

Obsidian

Obsidian (principally SiO2)

Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Obsidian

Volcanic glass (Mainly SiO2)

Black Obsidian

Volcanic Glass (predominantly SiO2, Silicon Dioxide)

Mahogany Obsidian

Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)

Snowflake Obsidian

Volcanic glass with Cristobalite inclusions (mostly SiO2)

Obsidian

Volcanic Glass (70-75% SiO2 with MgO and Fe3O4)

Obsidian

Volcanic Glass (predominantly SiO2 – Silicon Dioxide, but non-crystalline)