A mineral of sodium-aluminum or potassium-aluminum silicate, occurring global in igneous stones and utilized in the manufacture of ceramics and enamels.
A feldspathoid mineral of silica-poor igneous, plutonic and volcanic rocks. Chemically, nepheline is a plagioclase feldspar with inadequate silica to fulfill the substance bonds. Because of the unfilled bonds, nepheline weathers rapidly and can simply be seen as inclusions in newly damaged rock.
A mineral occuring at Vesuvius, in glassy hexagonal crystals; also in other places, in grayish or greenish masses having a greasy luster, due to the fact variety elæolite. It really is a silicate of aluminia, soft drink, and potash.
a whitish mineral comprising sodium aluminum silicate or potassium aluminum silicate in crystalline kind; used in the manufacture of ceramics and enamels