Do You Know Moh?
Here's a Quiz to test your knowledge of the Moh's Scale of hardness. First you need to identify each crystal in the pairs, and then decide which is the hardest.
Hover you mouse over the photograph to reveal the answers :)
Here's the answers to the Monochrome Quiz on our facebook page:
Hover your mouse over each image to reveal its name, or click on it to see more detail on the stone :)
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