Portland cement clinker is a dark grey nodular material made by heating ground limestone and clay at a temperature of about 1400 °C - 1500 °C. The nodules are ground up to a fine powder to produce cement, with a small amount of gypsum added to control the setting properties.

Portland cement clinker contains four principal minerals:

Alite: approximately tricalcium silicate (typically about 65% of the total)

Belite: approximately dicalcium silicate (typically about 15% of the total)

Aluminate: very approximately tricalcium aluminate (typically about 7% of the total)

Ferrite: very approximately tetracalcium aluminoferrite (typically about 8% of the total) 

Clinker Composition:

In cement chemistry, chemical analyses are normally given in oxide form - a typical example of an analysis follows:

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