This is a sharp docecahedron of hackmanite from this find (see below). The reason the crisp crystal form is so visible on this specimen is that the veneer of albite crystals on this specimen is relatively thin. Some small calcite crystals in association. In excellent condition – no damage. This is a great thumbnail-sized specimen from this find.
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About these Specimens of Sodalite var. Hackmanite
Although sodalite is a relatively common mineral at Mont Saint-Hilaire, well-formed crystals are quite rare. These specimens are from a pocket collected by Gilles Haineault in 1994. The specimens from this pocket are entirely distinctive, as the hackmanite crystals are coated with albite crystals.