Science quiz
The Mohs hardness scale in order
Ten minerals define the Mohs scale. Sort them from the softest to the hardest.
- Format
- Put them in order
- Items
- 10 to sort
- Limit
- None
- Level
- Medium
- Checked
- 2026.10.03
See every entry and put the whole list in order.
- Entries
- 10
- Sort by
- Mohs hardness
- Time limit
- None
- Touch screens start in Tap mode: tap the entries in order, and tap one again to take it back.
- Drag mode: drag an entry (press and hold on a phone), or use the arrow buttons.
- Keyboard: space to pick up, arrows to move, space to drop.
- Pause whenever you like (Esc). The board hides while the clock is stopped.
About this quiz
The Mohs scale ranks minerals by which can scratch which. A mineral scratches anything softer than itself, so a few everyday objects are enough to test a sample in the field.
- A fingernail has a hardness of about 2.5, so it scratches talc and gypsum.
- A copper penny is about 3.5 and a steel nail about 6.5.
- A knife blade or a glass plate is about 5.5, between apatite and orthoclase.
Sources
- [1]U.S. National Park Service. Mohs Hardness Scale.
Note on the data. The ten reference minerals, their order and the hardness of the everyday test objects follow the National Park Service article on the Mohs scale, checked on 3 October 2026.
Last checked October 3, 2026
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