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<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>Frank C. Hawthorne</dc:contributor>
  <dc:contributor>Danielle M. C. Huminicki</dc:contributor>
  <dc:contributor>Patrick Haynes</dc:contributor>
  <dc:contributor>Joel D. Grice</dc:contributor>
  <dc:contributor>Howard T. Evans Jr.</dc:contributor>
  <dc:creator>Michael Schindler</dc:creator>
  <dc:date>2003</dc:date>
  <dc:description>&lt;div&gt;&lt;div id="15286877" class="article-section-wrapper js-article-section js-content-section  "&gt;&lt;p&gt;Bobjonesite, V&lt;sup&gt;4+&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;O (SO&lt;sub&gt;4&lt;/sub&gt;) (H&lt;sub&gt;2&lt;/sub&gt;O)&lt;sub&gt;3&lt;/sub&gt;, is a new mineral species from Temple Mountain, Emery County, Utah, U.S.A. It occurs as blue-green crusts and efflorescences in fractures in a fossil (Triassic) tree; individual crystals are &amp;lt;&amp;lt;1 mm and are intimately intergrown. Bobjonesite hydrates very easily, and is unstable in all but the driest atmosphere. Its structure was determined on a crystal of bobjonesite; however, the physical properties, optical properties and X-ray powder-diffraction pattern were recorded on the synthetic equivalent, and an electron-microprobe analysis was not possible. Bobjonesite has a pale blue streak, a vitreous luster and no observable fluorescence under ultraviolet light. It has no cleavage or parting. The Mohs hardness is ~1, and the calculated density is 2.28 g/cm&lt;sup&gt;3&lt;/sup&gt;. Bobjonesite is biaxial positive, with α 1.555(2), β 1.561(1), γ 1.574(2), 2&lt;i&gt;V&lt;/i&gt;(obs.) = 72(1)°, 2&lt;i&gt;V&lt;/i&gt;(calc.) = 69°; it is non-pleochroic,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;X&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;=&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;b&lt;/i&gt;,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Y&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;≈&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;a&lt;/i&gt;,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Z&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;∧&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;c&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;≈ 19° (in β obtuse). Bobjonesite is monoclinic, space group&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;P&lt;/i&gt;2&lt;sub&gt;1&lt;/sub&gt;/&lt;i&gt;n&lt;/i&gt;, cell dimensions from single-crystal data:&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;a&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;7.3940(5),&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;b&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;7.4111(3),&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;c&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;12.0597(9) Å, β 106.55(1)°,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;633.5(1) Å&lt;sup&gt;3&lt;/sup&gt;,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Z&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;= 4. The strongest seven lines in the X-ray powder-diffraction pattern [&lt;i&gt;d&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;in Å(&lt;i&gt;I&lt;/i&gt;)(&lt;i&gt;hkl&lt;/i&gt;)] are as follows: 5.795(100)(002), 3.498(90)(112), 3.881(48)(1̅03), 5.408(37) (101), 4.571(20)(012), 6.962(11)(1̅01) and 6.254(11)(011). The chemical formula was derived from crystal-structure analysis; the end-member formula is V O (SO&lt;sub&gt;4&lt;/sub&gt;) (H&lt;sub&gt;2&lt;/sub&gt;O)&lt;sub&gt;3&lt;/sub&gt;. The crystal structure of bobjonesite was refined to an&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;index of 3.6% for 1105 observed (|&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;o&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;| &amp;gt; 5&amp;gt;&lt;i&gt;F&lt;/i&gt;) reflections measured with an automated four-circle X-ray diffractometer using Mo&lt;i&gt;K&lt;/i&gt;α X-radiation. There is one&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;V&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;site occupied by V&lt;sup&gt;4+&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;and surrounded by three O atoms and three (H&lt;sub&gt;2&lt;/sub&gt;O) groups in an octahedral arrangement, with one short vanadyl bond (1.577 Å), four similar equatorial bonds (&amp;lt;2.022 Å&amp;gt;), and one longer V–O bond (2.278 Å)&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;trans&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;to the vanadyl bond. The structure consists of isolated [V&lt;sup&gt;4+&lt;/sup&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;O&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(H&lt;sub&gt;2&lt;/sub&gt;O)&lt;sub&gt;6&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(SO&lt;sub&gt;4&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt;] clusters linked by hydrogen bonds.&lt;/p&gt;&lt;/div&gt;&lt;/div&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.2113/gscanmin.41.1.83</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Mineralogical Association of Canada</dc:publisher>
  <dc:title>Bobjonesite, V4+ O (SO4) (H2O)3, a new mineral species from Temple Mountain, Emery County, Utah, U.S.A</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>