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Mineralpedia Details for Sodalite

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Sodalite

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

Formula
Na4Si3Al3O12Cl 
Crystal System
Isometric 
Crystal Habit
Massive - Granular, Disseminated 
Cleavage
Poor, None, None 
Luster
Vitreous - Greasy 
Color
azure blue, white, pink, gray, green 
Streak
white 
Class
Isometric - Hextetrahedral 
Fracture
Brittle - Conchoidal 
Hardness
WebMineral
View Sodalite 
Mindat
View Sodalite 

Sodalite from Faisabad, Kokcha Valley, Badakhshan, Afghanistan

Sodalite
            from Faisabad, Kokcha Valley, Badakhshan, Afghanistan Large 2.5cm, well-formed light purple crystal.
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Sodalite from Lajuar Madan, Sar-e-Sang dist., 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.

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Sodalite var. Hackmanite from Kiran, Kokcha Valley, Badakhshan, Afghanistan

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.

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Sodalite from Bancroft, Ontario, Canada

Sodalite
            from Bancroft, Ontario, Canada

Blue veins of Sodalite with yellow Calcite.

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Sodalite from Diamond Jo quarry, Magnet Cove, Hot Spring Co., Arkansas, United States

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.

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Sodalite from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Sodalite
            from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Deep blue Sodalite crystals to 2mm with white Dawsonite. A feldspathoid.

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Sodalite var. hackmanite from Kola Peninsula, Russia

Sodalite var. hackmanite
            from Kola Peninsula, Russia
Special Info
Fluorescent

Colorless, glassy but murky, Sodalite variety hackmanite. FL. 

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Sodalite from Itaju do Colônia, Bahia, Brazil

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.

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