1. Biotite, cancrinite and sodalite are characteristic of this rock. 2. It is essentially a microcline, sodalite and cancrinite variety of nepheline syenite. 3. Although massive sodalite samples are opaque, crystals are usually transparent to translucent. 4. Most sodalite will fluoresce orange under ultraviolet light, and hackmanite exhibits tenebrescence. 5. Sodalite or hauyne may also be present, but nepheline is typically absent.6. Sodalite transforms into cancrinite when exposed to high temperature.7. Eventually, sodalite is found along hydrothermal fractures. 8. I've went ahead and created sodalite with the new facto / infobox. 9. These last consist of an intermixture of nepheline or sodalite and alkali-feldspar. 10. There is a sodalite mine to the east.
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