mineral
Sodalite in Feldspar Matrix
Sodalite (Na8(Al6Si6O24)Cl2)
Hardness: 5.5-6 (Mohs), Color: Royal blue with white marble-like veins, Luster: Vitreous to greasy, Crystal System: Isometric, Specific Gravity: 2.27-2.33
- Hardness
- 5
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Physical properties
Hardness: 5.5-6 (Mohs), Color: Royal blue with white marble-like veins, Luster: Vitreous to greasy, Crystal System: Isometric, Specific Gravity: 2.27-2.33
Formation & geological history
Formed in silica-poor igneous rocks such as nepheline syenites and phonolites, often associated with pegmatites or metamorphic environments. Significant deposits are typically millions of years old.
Uses & applications
Primarily used as a decorative stone, gemstone for jewelry (cabochons/beads), and as an ornamental material for carvings and sculptures.
Geological facts
Sodalite was first discovered by Europeans in Greenland in 1811 but became popular after large deposits were found in Ontario, Canada in 1891. It is often confused with Lapis Lazuli but lacks the pyrite (gold flecks) typically found in Lapis.
Field identification & locations
Identified by its rich blue color and association with white feldspar or calcite. In the field, look for a greasy luster and massive (non-crystalline) habit. Common locations include Brazil, Canada (Bancroft), and Namibia.
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