Hello, I somehow found myself in possession of what appears to be a nut, but have no idea what it is. At first I thought it might have been the pit of some citrus fruit, but now I am wholly unsure. I thought maybe one of you more experienced wielders of nuts could help me. I took the best/biggest/hi-res pics I could. Also, I'm not sure if it has an "inner core" to it that is the true seed, as some nuts do, or if this is the innermost part of it. Thanks in advance!