Sodalite Syenite

Physical Properties

Hardness: 5.5-6.0 Mohs; Color: Salt-and-pepper white/grey with distinctive blue spots; Luster: Vitreous to greasy; Crystal Structure: Isometric (for sodalite crystals within the matrix); Cleavage: Poor/None; Specific Gravity: 2.3 - 2.6.

Formation & Geological History

Formed from silica-poor alkaline magmas deep within the Earth's crust. It crystallizes in plutonic environments where tectonic activity allows for the cooling of alkali-rich intrusive bodies.

Uses & Applications

Primarily used as an ornamental stone, for lapidary work (cabochons, beads), and as a decorative architectural stone. Polished specimens are popular among mineral collectors.

Geological Facts

This specific variety is often associated with names like 'Blueberry Stone' or 'Sodalite in Matrix.' Many specimens of sodalite exhibit strong fluorescence under UV light, glowing a bright orange-pink.

Field Identification & Locations

Identify in the field by looking for 'royal blue' flecks or patches within a light-colored, granular igneous rock. It lacks the gold pyrite flecks commonly found in Lapis Lazuli. Found in alkaline complexes like those in Ontario, Canada, or Namibia.

Identified on: 4/18/2026

Mode: Standard