Nepheline

Nepheline is a rock-forming mineral. The formula of nepheline in some sources will list it as NaAlSiO4. It is usually massive and in unattractive specimens, though a handful of localities have produced well-crystallized examples of this mineral. Nepeheline is a primary constituent of nepheline syenite rocks and nepheline syenite pegmatites, forming in alkali-rich plutonic environments often together with a host of rare minerals.

Properties

thick tabular structure

hardness of 6 (Mohs)

density of 2.6 g/cm3

high degree of whiteness (colour value Y > 90)

high chemical resistance

low refraction index of 1.53–1.55

transparent behaviour in many binding agent systems

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