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Materials
- Basalt (basic igneous rock)142 objects
- Quartzite95 objects
- Chert84 objects
- Obsidian39 objects
- Flint (rock)30 objects
- Quartz (mineral)8 objects
- Sandstone3 objects
- Porphyry2 objects
- Limestone1 objects
- Mudstone1 objects
- Opal1 objects
- Rhyolite1 objects
- Schist1 objects