LaMoine,

Pardon me for offering a "guess", I'm sure others will provide a more expert response. I'm guessing this is the tip for a pike. This weapon was issued in some numbers in the South at the beginning of the war and perhaps most famously, to the Georgia militia. I recall, at least, one Union regiment being issued these weapons early in the war.

pike
Pronunciation[pahyk]
Pronunciation noun, verb, piked, pik·ing.
–noun
1. a shafted weapon having a pointed head, formerly used by infantry.
–verb (used with object)
2. to pierce, wound, or kill with or as with a pike.

I'll be interested to hear what others have to say.

Jim Martin