Tenebrescent Blue Sodalite, Zircon, Feldspar, etc. - Mont Saint-Hilaire, Québec, Canada
Contributed by: FMS Admin
Date: May 14th, 2026
Locality: Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada (See on Mindat)
Size: 11.3 x 8.3 x 14.7 cm
Description:
This is one of many specimens I recovered from a boulder in the quarry in Mont Saint-Hilaire in 2018. While it is far from being the best piece of blue sodalite I found that day, it is still one of the best specimens from that trip, because of all the bright yellow fluorescing zircon that shows up when the specimen is under shortwave UV. One of the best pieces of tenebrescent blue sodalite I found that day is shown in one of my other posts.
Originally posted by Frédéric Messier Leroux on Nature's Rainbows in 2021.
Summary of luminescence responses:
Sodalite (Mindat) (RRUFF)
- Fluorescence under Longwave (365nm LED) UV light: Orange
- Fluorescence under Midwave (305nm LED) UV light: Orange
- Fluorescence under Shortwave (255nm LED) UV light: Red
- Tenebrescence after exposure to Shortwave (255nm LED) UV light: Purple
- Fluorescence under Midwave (305nm LED) UV light: Yellow
- Fluorescence under Shortwave (255nm LED) UV light: Yellow