Wow never seen that before are you using the same brand of lye you always use?
That is just lye, mimosa and water right? Are you using distilled water?
Have you given it a good stir I know the water can form around the mimosa making a kind of gray paste but never seen it that bad. Was the MHRB powdered as much as you usually get?
Have you tried a hot water bath might make it all mix together better?
You can try and do a pull and see what happens as long as you don't throw anything away their is always hope.
The only other thing I can think it is, is lye that hasn't fully dissolved or that your lye contained aluminum, did it have gray beads in it?
Maybe it's an impurity from your mimosa but I highly doubt that looks almost metallic in the picture.
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