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Materials
- Basalt (basic igneous rock)79 objects
- Chert72 objects
- Quartz (mineral)28 objects
- Quartzite12 objects
- Flint (rock)6 objects
- Limestone5 objects
- Mudstone2 objects
- Obsidian2 objects
- Chalcedony1 objects
- Rhyolite1 objects
- Siliceous rock1 objects