I am not sure if this is a proper forum for this, but here goes...

I have a blackboard from an old schoolhouse. It is approx. 4 feet by six feet. I do not have a place in my house to use it, and so thought of using it outside in the garden in some way. I do not know how to cut it, or I could make it useable in my kitchen. I am worried that it may be too brittle to cut. It is 3/8 inch thick.