Doubly terminated Serandite crystal, with a flat termination by the pinacoid at the base and polycrystalline terminations at the end of the prism, of a very intense red color and with inclusions of Aegirine, two of them very marked and with well-defined crystals, and impregnations at the base of cream-colored crystals of Polylithionite, a curious phyllosilicate of potassium, lithium and aluminum.
Mont Saint-Hilaire is an alkaline intrusion belonging to the Monteregian Hills Igneous Belt, world-famous for its exceptional mineralogy with more than 430 recorded species, many of them type-locality. The rocks consist of nepheline syenites and carbonatites with miarolitic cavities hosting rare minerals.
Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec Canada
Specimen size: 7.4 × 3.8 × 2.1 cm = 2.91” × 1.50” × 0.83”
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