Mineralpedia Details for Sodalite
Named for its sodium content, Sodalite forms in nepheline syenites, phonolites and other related rocks, and can also be found in hydrothermally altered calcium-rich rocks and within vugs and cavities in volcanic blocks. A widespread mineral, Sodalite is prized as an ornamental stone. The Sodalite variety hackmanite is named for Finnish geologist Victor Axel Hackman who was a Professor the the Univerity of Helsinki and a geologist at the Finnish Geological Survey. Hackamnite has reversible photochromism called tenebrescence, which causes it to change color when exposed to ultraviolet light. Heating will destroy this effect. Sodalite has a bright reddish-orange cathodoluminescence and fluorescence under both long- and short-wave ultraviolet light and has a yellow phosphorescence. Sodalite might give off a sulfur-like scent when fractured.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/sodalite.pdf
- Crystal System
- Crystal Habit
- Massive - Granular, Disseminated
- Poor, None, None
- Vitreous - Greasy
- azure blue, white, pink, gray, green
- Isometric - Hextetrahedral
- Brittle - Conchoidal
- View Sodalite
- View Sodalite
Sodalite from Faisabad, Kokcha Valley, Badakhshan, Afghanistan
Sodalite from Lajuar Madan, Sar-e-Sang dist., Badakhshan, Afghanistan
Euhedral crystals to 2-3mm associated with brght orange Wurtzite and Pyrite.
Neon blue, lustrous and superb Sodalite crystals to 2.5mm. Dozens of Sodalite crystals associated with Pyrite.
Sodalite var. Hackmanite from Kiran, Kokcha Valley, Badakhshan, Afghanistan
Deep magenta, modified cubic crystal of Sodalite variety Hackmanite nicely perched on matrix of whitish-yellow Winchite. The Hackmanite crystal is to 1.5 x 2cm is somewhat crude, as these usually are. The Hackmanite also fluoresces bright orange.
Sodalite from Bancroft, Ontario, Canada
Blue veins of Sodalite with yellow Calcite.
Sodalite from Diamond Jo quarry, Magnet Cove, Hot Spring Co., Arkansas, United States
- Special Info
- Henry deLinde Collection
Nice blue Sodalite in a thin veneer as seen in the last photo. Comes with a label from Henry deLinde's collection, an expert on the mineralogy of the area and claim holder. Henry was a member of the famous CCA, Coon Creek Association which included several famous mineralogists besides deLinde including Don Owens, Al Kidwell, Buford Nichols, Mike Howard, Lourens Wals, Art Smith, and Dr. Charles Milton. What a group! I'm tickled to have acquired much of Don Owens' collection, Dr. Al Kidwell's, Dr. Buford Nichols' collection, and much of Art Smith's collection. Without these guys a lot of the minerals of this area may not have ever seen the collector market and reach such a known status of famous mineral localities.
Sodalite from Mont Saint-Hilaire, Rouville Co., Quebec, Canada
Deep blue Sodalite crystals to 2mm with white Dawsonite. A feldspathoid.
Sodalite var. hackmanite from Kola Peninsula, Russia
- Special Info
Colorless, glassy but murky, Sodalite variety hackmanite. FL.
Sodalite from Itaju do Colônia, Bahia, Brazil
Deep blue crystalline mass of Sodalite, a member of the feldspathoid group. The feldspathoids are formed under silca poor conditions. Like a feldspar, it is also a framework silicate. Pure sodalite is colorless, the blue is caused by an imurity. Unlike a feldspar member, Sodalite crystallizes in the cubic system.