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<p>materials such as <a href="page.php?w=clay">clay</a> during the <a href="page.php?w=cement_kiln">cement kiln</a> stage.</p>

<p><big>Composition and preparation</big></p>
<p>Portland clinker consists of four minerals: two <a href="page.php?w=calcium_silicate">calcium silicate</a>s, <a href="page.php?w=alite">alite</a> (Ca<sub>3</sub>SiO<sub>5</sub>) and <a href="page.php?w=belite">belite</a> (Ca<sub>2</sub>SiO<sub>4</sub>), along with <a href="page.php?w=tricalcium_aluminate">tricalcium aluminate</a> (Ca<sub>3</sub>Al<sub>2</sub>O<sub>6</sub>) and <a href="page.php?w=calcium_aluminoferrite">calcium aluminoferrite</a></p><p>
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