<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>A.H. Truesdell</dc:creator>
  <dc:date>1962</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;THE low-temperature chemical alteration of natural glass occurs in two stages: an initial stage in which it remains glassy but absorbs as much as 6 per cent water&lt;/span&gt;&lt;sup&gt;1&lt;/sup&gt;&lt;span&gt;, and a final stage in which devitrification to clay minerals, with release of silica, occurs&lt;/span&gt;&lt;sup&gt;2,3&lt;/sup&gt;&lt;span&gt;. During the first stage the composition of the glass may change, with gain of K&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;O and water and loss of Na&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;O (Smith, R. L., personal communication). This change is due to ion exchange.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1038/194077b0</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Nature Publications</dc:publisher>
  <dc:title>Study of natural glasses through their behaviour as membrane electrodes</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>