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This is a rock of some sort no part or pad a Rock?Hmmm? A wild guess, what you have is a piece of refuse from an old kiln/furnace fired glazed ceramic or pottery. Any historic pottery furnaces in the area?
probably not but part of it reminds me of a worn out brake pad
View attachment 1986228
looks like rubber or gasket on it
Meh.
Rock but what kind its all burt where it is black