Initial google searches are stating that you obtain more spirit iron chunks in nioh by disassembling divine items, but i'm only ever getting divine fragments from it. I had several hundred at one point, which i've blown through, and haven't figured out how to obtain more.
2 Answers
I believe you get spirit iron chunks from disassembling rare items (blue) and spirit iron fragments from uncommon items (yellow). You also get two each time for completing the very short side mission "The Battle of Ohashi" in the Kinki region. It's completed by defeating only one enemy, so that's probably the fastest way.
I expected disassembling green items is what was needed for chunks, it is apparently non green items.
Additionally, I had not noticed but you can "switch materials (triangle)" to use your divine fragments. I'm assuming divine fragments give better possibilities or max values in your reforges.
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@Kodama I misread things, and I didn't realize it was a self answer. It seemed more like a comment anyway, but you're right. Mar 19, 2017 at 15:41