Across
- 3. A mineral known for its hardness and clarity.
- 4. A fine-grained rock often used for roofing.
- 8. A dark volcanic rock.
- 9. A light volcanic rock that can float on water.
- 10. A rock composed of sand-sized grains.
Down
- 1. A common type of hard igneous rock.
- 2. A metamorphic rock used in sculpture.
- 5. A sedimentary rock used in building.
- 6. A volcanic glass formed from cooled lava.
- 7. A hard type of quartz used in tools.