Monteregianite

A fine microcrystalline example of Monteregianite-(Y) from the classic Mont Saint-Hilaire alkaline complex, the type locality for this rare phosphate-silicate species. The specimen hosts minute but well-defined crystals, displaying the subtle brownish to pale yellow hues characteristic of this uncommon mineral.

Monteregianite-(Y) is a rare yttrium-bearing phosphate-silicate species known almost exclusively from Mont Saint-Hilaire, where it forms late-stage phases in the complex’s highly evolved pegmatitic and hydrothermal assemblages. Its occurrence is typically microscopic, making any well-formed crystal exposure, even at micro size, a desirable addition to specialized collections focused on rare-earth minerals or the unique mineralogy of the Monteregian Hills.

This specimen is a representative micro from the type and only significant locality, ideal for micromount collectors and those seeking species-level completeness from Mont Saint-Hilaire.