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LocalitiesMont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
21st Nov 2013 20:58 UTCReiner Mielke Expert
21st Nov 2013 21:49 UTCRichard Gunter Expert
Does it look different from the normal tetrahedrons of Genthelvite?
The Genthelvite? from this cavity are flattened to a triangular shape but only some crystals fluoresce. Is this the paragenesis you have?
Richard Gunter
22nd Nov 2013 00:49 UTCReiner Mielke Expert
Associated minerals are aegerine, albite, analcime.
22nd Nov 2013 15:17 UTCRichard Gunter Expert
Your photos look like mine. There may be a phase here (a polymorph of Genthelvite?) that occurs as flattened triangular crystals. Mine was personally collected in 1977 from a car-sized boulder on the quarry floor. The Fluorite and some of the Genthelvite fluoresces in SW UV on my sample. There are rough Catapleiite and prismatic Ancylite on the sample as well.
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