Wayne Thompson of Heritage Restoration has begun working on the East Wall of the Slave Quarters. Thompson is in the process of repointing the entire wall and while he was prepping the existing joints he found some more debris. He discovered more porcelain tile and some black stones. At first we believed the black stones were coal but after cleaning them up it was discovered that they were in fact Obsidian, which is a volcanic rock. This is very intriguing because it means that someone deliberately found the obsidian and placed it in the wall. Was this part of a ritual to protect the building? More research is needed.