Natrolite and Microcline - Poudrette Quarry, Mont St-Hilaire, Canada

Contributed by: Chris Clemens
minID: 3WH-7MA
Date: Apr 27th, 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: 5.7 x 5 x 9.2 cm
Weight: 122 g

Description:
Cluster of small translucent natrolite crystals with interspersed crystals of microcline and an unidentified non-fluorescent brownish mineral. From the Poudrette Quarry, Mont St-Hilaire, Quebec, Canada. Under shortwave UV the natrolite shows a moderate green response, and the microcline fluoresces raspberry red.

Originally posted by Chris Clemens on Nature's Rainbows in 2017.

Fluorescence under shortwave UV light.

Normal light.

Summary of luminescence responses:

Microcline (Mindat) (RRUFF)

• Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red

• Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red