Across
- 5. Conchoidal fractures are characteristic of microcrystalline minerals such as ...
- 8. A geometric solid having four sides that are equilateral triangles resembling a pyramid.
- 9. ... rocks form when lava or magma cools and minerals crystallize.
- 10. Small pieces of rock that are moved and deposited by wind, water, glaciers, and gravity.
- 11. Porphyry has a ... texture.
- 13. Minerals that contain silicon and oxygen, and usually one or more other elements.
- 14. Named after Kimberly, South Africa, Unusual rocks that are a variety of peridotite.
- 15. The primary feature of sedimentary rock is horizontal layering called ...
- 17. Valuable minerals that are prized for their rarity and beauty.
- 18. Consists of weakly bonded sheets of tetrahedra.
- 19. Basaltic rocks such as ... are dark-colored with low silica content.
Down
- 1. Granite is light-colored with a high ... content.
- 2. ... has perfect cleavage in three directions.
- 3. Pumice has a ... texture.
- 4. Intrusive rocks form when magma cools and ... below Earth's surface.
- 6. Ores of rare elements, such as lithium and beryllium, form in ...
- 7. Talc is the ... mineral.
- 12. Compounds of oxygen and a metal.
- 16. The hardest mineral.