Mineral Specimen #2124    Sodalite varierty: Hackmanite

Poudrette Quarry, Mont Saint-Hilaire, Rouville RCM, Monteregie, Quebec, Canada

9.7 x 12 x 4.6 cm
3.8 x 4.7 x 1.8 in

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Pre. 1975

This is a very large piece of the variety of Sodalite known as Hackmanite. Hackmanite is known for its tenebrescence. When exposed to SW UV for a prolonged period, its color changes to a rose/purple color. This is short lived and fades quickly when exposed to bright white light. To get these pictures, it was necessary to take the pictures very quickly under low light with a long exposure time. Under SW UV, the Hackmanite fluoresces a yellow/orange. This specimen was part of Dan Langham's fluorescent display which he exhibited at shows under southern Michigan in the 1960s and early 1970s.

From the Don Langham collection

This mineral is also found in the following galleries: Minerals From Canada | Tectosilicates | Minerals Priced Between 50 and 99 Dollars This mineral is also found in the following galleries: Minerals From Canada | Tectosilicates | Minerals Priced Between 50 and 99 Dollars