This is a rich specimen of the relatively rare hydrated sodium zirconium silicate elpidite, seen here in a specimen from the prolific Mt. St. Hilaire locality. (The elpidites are the thin, acicular crystals.) They are often seen in single sprays without matrix, but this specimen shows more of a "haystack" of separate crystals. 5.3 x 4.9 x 2.8 cm