The first hint to crack the puzzle "Metamorphic rock that sounds nice" is:

It is a word which contains 6 letters

The second hint to crack the puzzle "Metamorphic rock that sounds nice" is:

It starts with letter g

The third hint to crack the puzzle "Metamorphic rock that sounds nice" is:

It ends with letter s

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The answer for the puzzle "Metamorphic rock that sounds nice" is: