Nepheline Syenite (R7093)

Nepheline syenite is a holocrystalline plutonic rock composed largely of nepheline and alkali feldspar.
The rocks are mostly pale, gray or pink in color and do not differ in general appearance from granites, although dark green varieties are also known.
Phonolite is the fine-grained extrusive equivalent.

Packaging: 1 kg (2,20 lb)

Chemical Analysis (%)
SiO2: 56.93
Al2O3: 21.37
Fe2O3: 1.29
TiO2: 0.17
CaO: 2.37
MgO: 0.60
Na2O: 9.21
K2O: 5.72
S1O3: 0.12
LOI and other: 2.22

Na₃ Kal Si₄O₁₆ Syenite is a coarse crystalline igneous depth rock because it cools slowly and is mainly composed of alkaline feldspars.
These are orthoclase, albite, perthite and a small amount of microcline.
Other minor components of syenite are quartz, ferromanganese (biotite, hornblende, pyroxene) and additional minerals such as apatite, zircon, titan, magnetite, melanite and pyrite.
Nepheline, on the other hand, is a different mineral with a composition between orthoclase and albite, which makes up syenite with a large percentage.
Its chemical name is known as sodium and potassium aluminosilicate.
If nepheline replaces a small amount of quartz or some feldspar in syenite, syenite with nepheline emerges.
In the ceramic industry, feldspar and nepheline syenite are used as fluxes.
The use of nepheline syenite in the ceramic industry is in the form of a milled product with a fineness of 200, 325 and 400 mesh.
Nepheline syenite offers useful properties as both a glassy phase former and a melter.
Significantly reduces cooking temperature and time.