Okay, MAJOR SPOILER:
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The three pieces can be found in the following places:
1: From the Idol Head in the far northwest corner, after passing the Morn, Noon, and Dusk ritual tests
2: From the Spirits who want the bones of Amauna brought back to their proper resting place (near the middle)
3: From the Statue of Amaunator that you get to by crossing over the floor tile puzzle (or it may be from the shade that wants you to carry it across the tiles), it's back in there somewhere.
Check and see if you've done everything...also, make sure you give the pieces all to the same character, otherwise it won't form into the symbol.
