An elegant presentation of lustrous white analcime crystals to 5 mm partially covering black aegirine crystal from the famous Mont Saint-Hilaire, Canada. The analcime crystals grow one atop another. They are complete all over, sharp and well crystallized with porcelain faces. The elongated black aegirine blade forms the core. For references see the 1990 issue of The Mineralogical Record vol. 21, # 4. In very good condition - some small contacts.

Cool!