rocks and minerals

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Across
  1. 4. starts as magma, extrusive and intrusive formations
  2. 8. when a mineral may act like a magnet
  3. 9. formed by heat and pressure
  4. 10. how a mineral reflects light
  5. 12. when minerals have a defined pattern on how they grow
  6. 14. when a mineral fizzes when put into weak acid
  7. 16. the color left behind when scratched on a porcelain plate
  8. 17. a non reliable test for mineral identification
  9. 18. clastic, chemical & inorganic, formed by cementation & compaction
Down
  1. 1. how easy/difficult it is to scratch a mineral
  2. 2. minerals that break along an even plane or smooth surface
  3. 3. when a mineral glows under a UV light
  4. 5. minerals that break along uneven lines or chip into irregular pieces
  5. 6. igneous rock, used by Native Americans for tools
  6. 7. how light or heavy a mineral sample is
  7. 11. look & feel of a rock's surface
  8. 13. sedimentary rock, used for building
  9. 15. metamorphic rock, used by architects and sculptors