As Kondraki said, it is sloppy. It could use rewording here and there, so it will sound more clinical, as is infamous to SCP articles.
I don't think short is necessarily a con, though it has potential for being a longer article. Suggestion: I'm notoriously stupid, so the way the stone kills people is a little confusing to me. Perhaps more detail on that, a test example?
The name is written on it, correct? This is a personal suggestion, but I think it would be awesome if the name were etched into the stone. As though someone had carved it. Though that's completely up to ya.