Where is Sodalite and Lapis Lazuli found?
Sodalite (Na8(Al6Si6O24)Cl2) and Lapis Lazuli (a rock composed primarily of lazurite, calcite, and pyrite)
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Open the appSodalite and Lapis Lazuli occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Sodalite and Lapis Lazuli
Sodalite: Bancroft, Ontario, Canada
Known for large deposits of high-quality blue sodalite, often with associated white calcite.
Sodalite: Ilimaussaq Complex, Greenland
A significant source of sodalite, often found in nepheline syenites.
Sodalite: Bahia, Brazil
Produces sodalite, sometimes with a more violet hue.
Lapis Lazuli: Badakhshan Province, Afghanistan
The most historically significant and primary source of the finest quality Lapis Lazuli for over 6,000 years, found in ancient marble deposits.
Lapis Lazuli: Lake Baikal, Siberia, Russia
Another important source, producing high-quality material.
Lapis Lazuli: Ovalle, Coquimbo Region, Chile
Produces Lapis Lazuli, often with a lighter blue color and more prominent calcite.
Collecting tips
- Sodalite: UV Fluorescence. Some sodalite exhibits orange fluorescence under longwave UV light, which can aid in identification.
- Sodalite: Hydrochloric Acid Test. Sodalite will slowly dissolve in hydrochloric acid, forming a gel and releasing hydrogen sulfide (rotten egg smell) if sulfur is present as an impurity. This test should be performed with caution in a well-ventilated area.
- Lapis Lazuli: Pyrite Inclusions. The presence of golden pyrite flecks is a strong indicator of natural Lapis Lazuli. Absence of pyrite or presence of uniform, glittery specks might indicate imitation.
- Lapis Lazuli: Calcite Streaks. White calcite streaks or patches are common in Lapis Lazuli and are a natural component of the rock. Excessive white can lower its value.
- Differentiation from Dyed Materials. Both sodalite and lapis lazuli are sometimes dyed. Examine for uneven color distribution, dye concentrations in fractures, or a 'plastic' appearance. A cotton swab with acetone can sometimes reveal dye on the surface.
Quick Check
- Color:
- Sodalite: Royal blue with white streaks. Lapis Lazuli: Deep azure to violet-blue with golden pyrite flecks and white calcite.
- Luster:
- Sodalite: Vitreous to greasy. Lapis Lazuli: Dull to greasy.
- Streak:
- Sodalite: White. Lapis Lazuli: Light blue (due to lazurite).
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