Blog

What is syenite used for?

What is syenite used for?

Like feldspar, nepheline syenite is used as a flux in tile, sanitary ware, porcelain, vitreous and semi-vitreous bodies. It contributes high alumina without associated free silica in its raw form and fluxes to form silicates with free silica in bodies without contributing free silica itself.

How strong is syenite?

The present paper is concerned with characterization and beneficiation of an Egyptian nepheline syenite rock, at Abu Khruq locality, Eastern Desert, Egypt. The ore is exceptionally hard, with high crushing strength of 875 kg/cm2, and iron oxide content of about 6.5%.

Where is syenite located?

In North America syenite occurs in Arkansas and Montana. Regions in New England have sizable amounts, and in New York syenite gneisses occur. The “great syenite dyke” extends from Hanging Rock, South Carolina through Taxahaw, South Carolina to the Brewer and Edgeworth mine in Chesterfield, South Carolina.

What color is syenite?

Nepheline syenite is a holocrystalline plutonic rock that consists largely of nepheline and alkali feldspar. The rocks are mostly pale colored, grey or pink, and in general appearance they are not unlike granites, but dark green varieties are also known. Phonolite is the fine-grained extrusive equivalent.

What is syenite rocks?

syenite, any of a class of intrusive igneous rocks essentially composed of an alkali feldspar and a ferromagnesian mineral. Chemically, syenites contain a moderate amount of silica, relatively large amounts of alkalies, and alumina. The name was first used by Pliny the Elder.

How is syenite mined?

Nepheline syenite is extracted from open pit mines. Ore is hauled to the mill, where it is put through a magnetic separation circuit to remove iron-bearing minerals. The mill produces several grades of nepheline syenite, based on grain size and iron content, to meet a wide variety of markets.

What type of rock is syenite?

syenite, any of a class of intrusive igneous rocks essentially composed of an alkali feldspar and a ferromagnesian mineral. A special group of alkali syenites is characterized by the presence of a feldspathoid mineral such as nepheline, leucite, cancrinite, or sodalite (see nepheline syenite).

What is a syenite rock?

What is the structure of syenite?

Syenite is intrusive igneous rock that basically composed of an alkali feldspar and a ferromagnesian mineral. A unique group of alkali syenites is characterized by the presence of a feldspathoid mineral inclusive of nepheline, leucite, cancrinite, or sodalite (see nepheline syenite).

Is syenite volcanic or plutonic?

Syenite is a coarsely crystalline plutonic intermediate rock consisting chiefly of alkali feldspar with less than 5% quartz and/or feldspathoid. Clinopyroxene, hornblende, biotite mica, or olivine may be present in minor proportions.

What type of rock is a syenite?

Is syenite a acid rock?

INTERMEDIATE IGNEOUS ROCKS. Although they are less used for building than acid or basic rocks, intermediate igneous rocks include some significant and attractive stones. Syenite is a coarsely crystalline plutonic intermediate rock consisting chiefly of alkali feldspar with less than 5% quartz and/or feldspathoid.

Syenite, any of a class of intrusive igneous rocks essentially composed of an alkali feldspar and a ferromagnesian mineral. A special group of alkali syenites is characterized by the presence of a feldspathoid mineral such as nepheline, leucite, cancrinite, or sodalite (see nepheline syenite).

What is the difference between syenite and granite?

A true syenite (sensu stricto) is also compositionally resembling granite. The most notable difference is the absence or very low quantity of quartz while it is an essential component of granite. The dominant mineral is alkali feldspar, usually orthoclase. This rock type is found in a wide variety of colors.

What is the difference between FOID syenite and syenitic?

Syenitic rock that contains quartz can not contain feldspathoids and vice versa — foid-bearing and foid syenites contain no quartz. The term “syenite” in a wider sense involves similar rock types like quartz syen., alkali feldspar syenite, foid syen., foid monzosyenite, etc. The classification principles are shown on the diagram below.

What are the characteristics of alkali syenites?

A special group of alkali syenites is characterized by the presence of a feldspathoid mineral such as nepheline, leucite, cancrinite, or sodalite (see nepheline syenite). Syenite, any of a class of intrusive igneous rocks essentially composed of an alkali feldspar and a ferromagnesian mineral.