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<h1>Sample description&nbsp;</h1>
<h2>Chemical composition</h2>
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      <td style="background-color: rgb(255, 255, 204);" colspan="5">weight percent</td>
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      <td style="font-family: monospace; text-align: center;">SiO<sub>2</sub></td>
      <td style="font-family: monospace; text-align: center;" valign="undefined">Al<sub>2</sub>O<sub>3</sub></td>
      <td style="font-family: monospace; text-align: center;" valign="undefined">Na<sub>2</sub>O</td>
      <td style="font-family: monospace;" align="undefined" valign="undefined">K<sub>2</sub>O</td>
      <td style="font-family: monospace; text-align: center;" valign="undefined">CaO</td>
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      <td style="font-family: monospace; text-align: center;" valign="undefined">50.32</td>
      <td style="font-family: monospace; text-align: center;" valign="undefined">15.33</td>
      <td style="font-family: monospace;" align="undefined" valign="undefined">5.23</td>
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