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Materials
- Obsidian941 objects
- Chert58 objects
- Basalt (basic igneous rock)27 objects
- Opal glass15 objects
- Quartz (mineral)12 objects
- Flint (rock)11 objects
- Quartzite11 objects
- Sandstone5 objects
- Petrified wood3 objects
- Gypsum1 objects
- Hornfels1 objects
- Siliceous rock1 objects