Plate 10

(a) — Overlapping ²¹⁰Po halos in biotite, using phase contrast; (b) and (d) — Thorium halo and giant halo in Madagascan mica; (c) — Dwarf halos in Ytterby mica; (e) - (f) — Assortment of different polonium halo types in biotite; (g) — ²¹⁴Po halos in biotite; (h) — A ²¹⁰Po and a ²¹⁴Po halo in biotite