Snowflake (reticulated) Cerussite is one of the most-desired forms of this mineral, not only for the delicate beauty but the relative rarity. This mini had very good form and excellent luster. You simply do not find good snowflakes coming available that often. And from IRAN, no less? these came out one time in the early 1990s, and this is one of the finest all-around snowflakes from that find I have seen.