A feldspathoid mineral (sodium potassium aluminum silicate), common in silica-poor igneous rocks, often greyish or greenish with a greasy luster (Elaeolite). It's associated with boosting creativity, self-esteem, and reducing stress.
Colorless, White, Grey, Yellowish, Greenish, Bluish, Reddish, Brownish
Nepheline is classified as a tectosilicate minerals, feldspathoid group mineral which typically crystallizes in the hexagonal system. Its chemical formula is (Na,K)AlSiO4. Common crystal habits include massive granular to prismatic.