Sodium feldspar is a kind of feldspar, which is a common feldspar mineral, which is sodium aluminosilicate (NaAlSi3O8). It is generally a glassy crystal, which can be colorless or white, yellow, red, green or black. It is the raw material for making glass and ceramics. Sodium feldspar is found in many rocks, and such minerals are called rock-forming minerals. Sodium feldspar is mainly used in the manufacture of ceramics, soap, tiles, floor tiles, glass, abrasives, etc. It is mainly used in glazes on ceramics.
Sodium feldspar, a common feldspar mineral, is sodium aluminosilicate (NaAlSi3O8). Most common in pegmatites and felsic igneous rocks such as granite, also in low-grade metamorphic rocks, and in some sedimentary rocks as authigenic sodium feldspar. It usually forms brittle glassy crystals of various colors. It can be used to make glass and ceramics, but its main significance is that it is a rock-forming mineral.
Sodium feldspar is a sodium terminal mineral of plagioclase solid solution series and alkaline feldspar series. It has a tripod-like structure, and silicon and aluminum are tetrahedral coordination, forming larger vacancies (that is, lattice positions), which are mainly occupied by cationic sodium. Although all silicon and aluminum atoms occupy tetrahedral positions in this structure, the specifics of their positions vary. The distribution of silicon and aluminum atoms is highly ordered at low temperature, but at a high temperature of about 1100°C, the distribution of atoms is much more disordered.
The chemical molecular formula of sodium feldspar is: Na2O·Al2O3·6SiO2. Its theoretical chemical composition is Na2O: 11.8%; Al2O3: 19.4%; SiO2: 68.8%. The appearance of sodium feldspar is generally white and gray, with a hardness of 6-6.5 and a density of It is 2.61-2.64 g/cm3, and its melting point is about 1100°C. It is difficult for the feldspar mineral in nature to reach its theoretical value. The closer the chemical composition of feldspar is to its theoretical value, the purer the feldspar and the better its quality. During the heating process, sodium feldspar has a theoretical melting point of 1100°C. The melting point of natural sodium feldspar ore varies with the chemical composition.