It's possible you're referring to a different rock or mineral. Could you please double-check the spelling or provide more context?
For example:
* Is it a specific type of rock found in Cumberland? If so, providing more details about the rock type (e.g., sandstone, granite) would help.
* Is it a name for a specific mineral? If so, let me know the correct spelling.
Once you provide more information, I can help you find the hardness of the material you're interested in.
