I've seen various kinds of fungus, separation and loads of dust inside lenses, but I haven't seen that before:
Admittedly, this mobile phone picture is not really sharp, but you can see here an otherwise great condition Rodenstock 80mm enlarger lens, with small, whiteish, crystal-like particles at the edge of one of the inner front elements. The diameter of the respective lens is around 20mm. The particles are unevenly distributed along the lens circumference, concentrated in two major areas. Particle / crystal orientation appears erratic, the particles won't move if tilting or shaking the lens. They do not really extend onto the glass either and show glittering reflections if properly illuminated.
I had the chance to buy this lens but didn't, so I can't take any further close look.