Among Arizona cerussites, these certainly are oddities, different than the typical forms. They are called "jackstraw clusters" by most. This is one of the heftiest and most solid large jackstraw cerussite specimens from the Flux Mine, Arizona, that I have seen in a long time. They turn up only rarely, in old collections. Most are fragile and gracile. Robust, hefty pieces like this are few. The pearlescent cerussite crystals to 3 cm are much more impressive in person. Excellent, old-time material from the Harold Urish Collection.