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Question:
Mid-Mohs scale mineral
Answer:
OPAL
Length:
4
Similar Crossword Questions:
Mohs scale mineral
Mineral that's the softest on the Mohs scale
Mineral at the soft end of the Mohs scale
Softest mineral on the Mohs scale
Inventor of a mineral hardness scale
It's 1 on the Mohs scale of hardness
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Mineral scale
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Eponymous developer of a mineral scale
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It's lowest on the Mohs scale