No, I wish they were. I have a few chert points and blades from this area but there's no obsidian in Florida. The picture is from an article discussing the use of the blades for sacrifices. Coincidentally though, my daughter returned a few days ago from a trip to Washington State and brought me a small obsidian knapped knife with a mountain goat horn tip for a handle that she bought somewhere up there. Not nearly as large or nice as your knife but still pretty cool.