Why does turquoise turn green?

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Tags

1. #stones
2. #actually
3. #contains
4. #aluminum
5. #other
6. #water
7. #result
8. #green
9. #oxidation
10. #compound
11. #copper
12. #metals
13. #oxidize
14. #words
15. #includes
16. #cause
17. #light
18. #color
19. #these
20. #turquoise
21. #change