I'm betting it's ash. When we did the "superlye" soap recipe with -40% lye excess, some people found their soap grew some amazing layers of ash. Some looked sparkly like snow, others looked like spiky fur. My batches got very ashy, but the ash looked like old chalky paint -- nothing much to ooh and ah about.
I would be careful with this soap -- handle it with gloves. It's possible the bits that are showing this oddball ash might be lye heavy.