igneous

Sodalite-rich Syenite (Sunset Sodalite)

Sodalite-Syenite (Na8[Al6Si6O24]Cl2 with KAlSi3O8)

Hardness: 5.5-6 (Mohs scale), Color: Mottled blue/grey with white inclusions, Luster: Vitreous to greasy, Structure: Isometric (massive), Cleavage: Poor, Specific Gravity: 2.2-2.3

Hardness: 5

Identified March 30, 2026More igneous →

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Physical properties

Hardness: 5.5-6 (Mohs scale), Color: Mottled blue/grey with white inclusions, Luster: Vitreous to greasy, Structure: Isometric (massive), Cleavage: Poor, Specific Gravity: 2.2-2.3

Formation & geological history

Formed in silica-poor igneous rocks (syenites) from late-stage hydrothermal fluids in alkali-rich magma. Typically found in Precambrian or Paleozoic shields.

Uses & applications

Used primarily in lapidary work for cabochons, beads, and pocket stones. Also used as ornamental dimension stone and as a source of alumina in some industrial processes.

Geological facts

Sodalite is often mistaken for Lapis Lazuli but lacks the golden pyrite specks. It is noted for its ability to fluoresce under UV light, sometimes showing bright orange streaks.

Field identification & locations

Identify by its distinctive mottled blue/gray color, white calcite or albite veins, and a 'salted' appearance. Commonly found in Canada (Bancroft), Namibia, and Brazil.

Other igneous specimens

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Blue Apatite

Fluorapatite (Ca5(PO4)3F)

mineral

Dark Igneous Rock (Likely Basalt or Diabase)

Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.

Igneous

Magnetite

Iron(II,III) oxide (Fe3O4)

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral

Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

mineral

Magnetite

Magnetite (Fe3O4)

mineral