Catalog Search Guide
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Sodalite
Sodalite is a deep-blue feldspathoid tectosilicate with the formula Na8Al6Si6O24Cl2, prized since the 19th century as an ornamental stone and coveted by mineral collectors for its rich royal-blue to violet-blue color, occasionally streaked with white calcite veining. It belongs to the sodalite group, alongside hauyne, nosean, lazurite and the rare tenebrescent species tugtupite. Sodalite typically forms in silica-poor alkaline igneous rocks such as nepheline syenites and their pegmatites, in carbonatites, and occasionally in metasomatized limestones or ejected volcanic blocks, commonly associated with nepheline, cancrinite, microcline, aegirine, natrolite and calcite.
Massive ornamental-grade sodalite comes mainly from Cerro Sapo in Cochabamba, Bolivia, prized for its intense, uniform blue used for carvings and cabochons, and from large deposits in Brazil, Namibia and Canada. Fine crystallized specimens, far scarcer than massive material, are the true collector's prize: Mont Saint-Hilaire in Quebec produces transparent, facetable sodalite crystals within its famous agpaitic pegmatite alongside serandite, eudialyte and villiaumite, while the Poudrette quarry at the same locality remains a benchmark source for well-formed dodecahedral crystals. Other classic North American occurrences include the Princess Mine and Bancroft area of Ontario, the Ice River alkaline complex near Kicking Horse Pass in British Columbia, and Magnet Cove, Arkansas, along with Litchfield, Maine. Rare euhedral crystals also occur on Mount Vesuvius in Italy, ejected in volcanic blocks, and in the marble skarns of Ladjuar Medam at Sar-e-Sang, Afghanistan, a source long associated with lapis-related feldspathoid mineralization.
A particularly sought-after variety is hackmanite, the tenebrescent form of sodalite that shifts from pale gray or white to vivid purple-pink on exposure to UV light or sunlight and fades back over time, historically associated with Mont Saint-Hilaire and Greenland and later with notable finds in Afghanistan and Myanmar. Many sodalite specimens also fluoresce bright orange under ultraviolet light, adding a further layer of appeal for fluorescent-mineral collectors. Because well-formed, gemmy crystals are considerably rarer than the massive ornamental material flooding the lapidary trade, crystallized sodalite from type localities like Mont Saint-Hilaire, Ice River and Bancroft commands strong interest among systematic collectors seeking rare crystal habits, fluorescence, and tenebrescent color-change varieties within the broader feldspathoid family.
