How many albums did Metallica black album sell?

Related questions

1. How many copies did the black album sell?
2. What made Metallica so great?
3. What is Metallica known for?
4. What does it mean if something is hard wired?
5. Is Metallica making an album with Lady Gaga?
6. Is Hardwired Metallica's last album?
7. How many black albums has Metallica sold?
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10. Is Metallica making a new album?

Tags

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2. #since
3. #nielsen
4. #album
5. #music
6. #tracking
7. #began
8. #metallica
9. #never
10. #sales
11. #selling
12. #united
13. #states
14. #probably
15. #million
16. #black
17. #things
18. #release
19. #fewer
20. #copies