<?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:contributor>J. J. Papike</dc:contributor>
  <dc:contributor>P.W. Weiblen</dc:contributor>
  <dc:creator>M. Ross</dc:creator>
  <dc:date>1968</dc:date>
  <dc:description>&lt;p&gt;&lt;span id="_mce_caret" data-mce-bogus="1" data-mce-type="format-caret"&gt;&lt;span&gt;Ten amphibole specimens from a variety of metamorphic rocks such as talc schists, eclogites, and metamorphosed iron formations contain lamellae of a second amphibole oriented parallel to (1̅01) or (100), or both, of the host. Tremolites, actinolites, and hornblendes commonly have lamellae of a calcium-poor clinoamphibole with&amp;nbsp;&lt;/span&gt;&lt;i&gt;P&lt;/i&gt;&lt;span&gt;2&lt;/span&gt;&lt;sub&gt;1&lt;/sub&gt;&lt;span&gt;/&lt;/span&gt;&lt;i&gt;m&lt;/i&gt;&lt;span&gt;&amp;nbsp;space-group symmetry, or lamellae of cummingtonite with&amp;nbsp;&lt;/span&gt;&lt;i&gt;C&lt;/i&gt;&lt;span&gt;2/&lt;/span&gt;&lt;i&gt;m&lt;/i&gt;&lt;span&gt;&amp;nbsp;space-group symmetry. Likewise cummingtonites and&amp;nbsp;&lt;/span&gt;&lt;i&gt;P&lt;/i&gt;&lt;span&gt;2&lt;/span&gt;&lt;sub&gt;1&lt;/sub&gt;&lt;span&gt;/&lt;/span&gt;&lt;i&gt;m&lt;/i&gt;&lt;span&gt;&amp;nbsp;clinoamphiboles commonly contain lamellae of calcium-rich&amp;nbsp;&lt;/span&gt;&lt;i&gt;C&lt;/i&gt;&lt;span&gt;2/&lt;/span&gt;&lt;i&gt;m&lt;/i&gt;&lt;span&gt;&amp;nbsp;amphiboles such as tremolite. Results of x-ray diffraction, electron-probe, and microscope studies indicate that most lamellae result from unmixing of a homogeneous amphibole. The&amp;nbsp;&lt;/span&gt;&lt;i&gt;P&lt;/i&gt;&lt;span&gt;2&lt;/span&gt;&lt;sub&gt;1&lt;/sub&gt;&lt;span&gt;/&lt;/span&gt;&lt;i&gt;m&lt;/i&gt;&lt;span&gt;&amp;nbsp;clinoamphibole is analogous to the clinopyroxene pigeonite in agreement with the results of M. G. Bown.&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1126/science.159.3819.1099</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>American Association for the Advancement of Science.</dc:publisher>
  <dc:title>Exsolution in clinoamphiboles</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>