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Across 3. a chemical combination of elements 4. measure of resistance to being scratched 6. 92 of them are natural and are ordered in the periodic table 8. number that an element is ordered by (2 words) 10. 10 is the hardest, 1 is the softest (2 words) 14. micas have the simplest 15. atom with the same number of protons but not neutrons 16. electrons shared by metal ions (2 words) 17. NaCl is an example (2 words)

Down 1. can be curvy, smooth, conchoidal, or in splinters/fibers 2. quartz, feldspar, muscovite, hornblende 3. forces holding atoms together in a compound (2 words) 5. most common group of mineral 7. visual expression of internal arrangement of atoms in a mineral (2 words) 9. silicon dioxide is one of the most common (2 words) 11. equals mass/volume 12. diamond has an adamantine 13. color of a mineral in its powdered form