Leucophanite from Mont Saint-Hilaire, Canada

Contributed by: Simone Conti
minID: D8R-UYY
Date: May 28th, 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: 4 x 3 x 26 mm
Weight: 0.26 g

Description:
Little crystal of leucophanite (3-4mm) perched upon black aegirine needles. The leucophanite fluoresces pink under shortwave or midwave UV light, violet under longwave and orange under 405nm blue laser.

Fluorescence under midwave UV light.

Fluorescence under longwave UV light.

Normal light.

Summary of luminescence responses:

Leucophanite (Mindat) (RRUFF)

• Fluorescence under Midwave (305nm LED) UV light: Pink
• Fluorescence under Longwave (365nm LED) UV light: Violet
• Fluorescence under 405nm blue laser: Orange