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Is this concrete?

last month
last modified: last month

This is not kitchen related but I know that there are stone experts on this forum.

This is my fireplace and I want to clean the hearthstone but I don't know what the material is. House built 1971 and the stone is held up by 4 metal ledges that are embedded into the fireplace brick. Does anyone know what it is and the best way to clean it?

This is what the front looks like along the long edge.

Side edge showing metal support.

The wet spot is where I was trying to clean with water and dish soap.

Top face of material.

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