PALYGORSKITE

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(Richard Willis)

Clay-making mineral of the group sepiolite-palygorskite, of the ideal form K2Na2CaMgAl2[OH Si4O10] 2H2O+2H2O with a typical empirical analysis of K2O 1.0%, Na2O 0.13%, CaO 1.04%, MgO 8.93%, Fe2 FONT>O3 3.90%, Al2O3 11.38%, SiO2 60%, traces lost 12.72%
Hardness: 2-2.5 Density: 2.1-2.2 Dissolves in hot HCl or H2SO4 Fluxes below 1000ºC

A feldspathic hydrous alumino-silicate high alkaline earth mineral. It is feldspathic and typially accompanied by sepiolite. In ceramics it behaves similarly to granites and volcanic feldspars but is much lighter and more porous than either (both palygorskite and sepiolite float in water), and has a greater inclination to opacify than either.


Authors

XML

<?xml version="1.0" encoding="UTF-8"?>
<material name="PALYGORSKITE" descrip="" generic="0" rawmineral="1" searchkey="" loi="0.00">
<families>
<family name="AlumSilicate"/>
</families>
<references>
<reference name="seealso" reason=""/>
<reference name="seealso" reason=""/>
</references>
<notes>
<note>Clay-making mineral of the group &lt;B&gt;&lt;I&gt;sepiolite-palygorskite&lt;/I&gt;&lt;/B&gt;, of the ideal form K&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;Na&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;CaMgAl&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;[OH Si&lt;FONT SIZE=2&gt;&lt;SUB&gt;4&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;10&lt;/SUB&gt;&lt;/FONT&gt;] 2H&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O+2H&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O with a typical empirical analysis of K&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O 1.0%, Na&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O 0.13%, CaO 1.04%, MgO 8.93%, Fe&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/
FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt; 3.90%, Al&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt; 11.38%, SiO&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt; 60%, traces lost 12.72%
Hardness: 2-2.5 Density: 2.1-2.2 Dissolves in hot HCl or H&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;SO&lt;FONT SIZE=2&gt;&lt;SUB&gt;4&lt;/SUB&gt;&lt;/FONT&gt;&lt;SUB&gt; &lt;/SUB&gt;Fluxes below 1000&amp;ordm;C

A feldspathic hydrous alumino-silicate high alkaline earth mineral. It is feldspathic and typially accompanied by sepiolite. In ceramics it behaves similarly to granites and volcanic feldspars but is much lighter and more porous than either (both palygorskite and sepiolite float in water), and has a greater inclination to opacify than either.

</note>
</notes>
</material>


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