| COUNTDOWN | SCORE | PERCENT | OUT OF |
| 0 | 0 | 0% | 0/0 |
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The Mohs Scale of HardnessQuestion 1 of 10 by Space Man ★ ★ ★ ★
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| Number 2 on the Mohs Scale. This mineral has the formula CaSO4 2H2O |
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Science General Knowledge Quiz |
