Syenite

PRODUCTS

SYENITE

SYENITE Feldspars (foids), such as nepheline syenite, are formed when the silicon in the residual melt is depleted during feldspar formation. Rocks with feldspar foids therefore basically contain no (or very little) crystalline quartz.

Syenite is a NO2-rich raw material that lowers the melting point in glazes because the mineral tends to form eutectic mixtures, or in other words, formulations: It lowers the melting temperature in the melt because it reacts with the quartz it contains and has a wide melting range of 1060-1230°C.
Our syenite comes from Keles Mining in Türkiye

SYENITE

Syenite is a raw material saver because, compared to feldspar, less of it is needed in the compositions (melts) to achieve the desired results. It therefore acts as a high quality feldspar substitute in melts and ceramic bodies.

In ceramic bodies it is used as a pre-firing leavening agent, as a flux in sanitary ceramics, in floor and wall tiles and in hard stone bodies. Again, the advantage is that syenite has a lower melting point than sodium feldspar and therefore requires less firing time and energy.
However, each industry has different requirements for the quality of nepheline syenite. In addition to price, selection criteria may include colour, iron oxide content, grading curve and other factors.

Depending on the "impurities" in the mineral, there are many colour variations of nepheline syenite worldwide, ranging from white, yellowish, grey, anthracite, green, blue, beige to brown. The colour spectrum of our raw nepheline syenite, due to hematite impurities, is in the golden yellow-beige-brown range.

The Mohs hardness of the syenite is between 6 and 6.5, the bulk density is between 60-1100 kg/m³, the specific gravity is between 2.5-2.7 g/cm³ and the SiO2 content is between 60-70%.

BRANCHES

Chemical industry

Glass industry

Ceramic industry

BRANCHES

APPLICATIONS

• Analogous to feldspar, our nepheline syenite is used as a flux for tiles, enamels and in stained glass production.
• Filler for plastics, paper, paints and varnishes and foams.
• Chemical industry
• Glass industry
• Ceramic industry
• low refractive index 1.53-1.5
• high chemical resistance
• In glass production, the alumina in NS, delays devitrification of the final product.
• In ceramic products, it increases the durability and inertness.

APPLICATIONS

FEATURES

low refractive index 1.53-1.5

high chemical resistance

In glass production, the alumina in NS, delays devitrification of the final product.

In ceramic products, it increases the durability and inertness.

SPECIAL FEATURES

CHEMICAL ANALYSIS

Chemical parameters (Raw-NS-avarage values)

SiO2 65-66 %
AlO2 16,5-19%
Na2O 4,0-5,5 %
K2O 6,0-7,5%
Fe2O3 1,5-2,5 %

Our Syenite is chemically similar
(standard geochemical sample), strongly similar to the USGS/STM1 nepheline syenite standard.

PHYSICAL PROPERTIES

Characteristics Unit/Remark

• Specific gravity: 2.55-2.76 kg/m³
• Color: beige-brown
• MOHS Hardness: 6-6.5
• Melting point: approx. 1200-1450 °C
• Grain shape: sandy, chippy
• Standard grain sizes: on request
• Special grain sizes: on request
• Packaging: big bag, bulk material
• Reach: no registration obligation; acc. to EC No. 1907/2006
• CAS No.: 37244-96-5
• Hazardous material: No

All information provided herein is for general and non-binding information purposes only and is not guaranteed to be accurate or complete. It does not constitute a general warranty of product characteristics.

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