Sedimentary (Volcanic)

Tree Agate

Dendritic Agate (Silicon Dioxide, SiO2)

Dendritic Agate

Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)

Porphyritic Basalt (Chinese Writing Stone or Flower Stone)

Porphyritic Basalt / Porphyry

Quartz (likely Milky Quartz or Chalcedony)

Quartz (SiO2 - Silicon Dioxide)

Obsidian

Obsidian (Volcanic Glass)

Obsidian

Obsidian (Volcanic Glass)

Obsidian

Volcanic Glass (SiO2)

Obsidian

Obsidian (Volcanic Glass)

Obsidian

Obsidian (Volcanic Glass)

Obsidian

Volcanic Glass (SiO2)

Obsidian

Volcanic Glass (SiO2)

Obsidian

Obsidian (Volcanic Glass)

Obsidian

Obsidian (Volcanic Glass)

Obsidian

Obsidian (Volcanic Glass)

Black Obsidian

Volcanic Glass (SiO2)

Black Obsidian

Obsidian (Volcanic Glass)

Obsidian

Obsidian (Volcanic Glass)

Obsidian

Volcanic Glass (SiO2)

Obsidian

Volcanic Glass (SiO2)

Obsidian

Obsidian (volcanic glass)

Obsidian

Obsidian (Volcanic Glass)

Obsidian

Obsidian (volcanic glass)

Carnelian

Carnelian (Silicon Dioxide - SiO2 with iron oxide impurities)

Shale

Shale (Consolidated fine-grained clay/silt)

Obsidian

Volcanic Glass (SiO2)

Obsidian

Obsidian (Volcanic Glass)

Obsidian

Volcanic Glass (SiO2)

Obsidian

Obsidian (Volcanic Glass)

Obsidian

Obsidian (Volcanic Glass)

Obsidian

Obsidian (Volcanic Glass)

Obsidian (Apache Tear)

Volcanic Glass (SiO2)

Pumice (likely weathered/water-worn)

Vesicular volcanic glass

Obsidian

Obsidian (Volcanic Glass)

Pumice (specifically a water-worn, weathered variety)

Vesicular volcanic glass

Obsidian

Obsidian (Volcanic Glass)

Apache Tears (Obsidian)

Volcanic Glass (SiO2)

Black Obsidian

Obsidian (Volcanic Glass)

Black Obsidian

Volcanic Glass (SiO2)

Obsidian

Volcanic Glass (SiO2)

Obsidian

Volcanic Glass (SiO2)

Obsidian

Obsidian (Volcanic Glass)

Obsidian

Volcanic Glass (SiO2)