Rocks And Minerals

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