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      <title>Introduction to Rocks and Minerals by Roslyn Dupre&#39;</title>
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      <pubDate>2018-10-06 17:59:34 UTC</pubDate>
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         <description><![CDATA[<div>Geode containing amethyst</div>]]></description>
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         <pubDate>2018-10-06 18:08:05 UTC</pubDate>
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         <pubDate>2018-10-06 18:09:49 UTC</pubDate>
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         <pubDate>2018-10-06 18:47:17 UTC</pubDate>
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         <description><![CDATA[Most Common Mineral of the Crust
If you consider it as one mineral, feldspar is the most common mineral and quartz comes in second, especially when you consider the whole crust (continental plus oceanic). Feldspar is called a group of minerals only for the convenience of geologists. The seven major feldspars blend smoothly into each other, and their boundaries are arbitrary. Saying "feldspar" is like saying "chocolate-chip cookies," because the name embraces a range of recipes. In chemical terms, feldspar is XZ4O8 where X is a mixture of K, Ca and Na and Z is a mixture of Si and Al. To the average person, even the average rockhound, feldspar looks pretty much the same no matter where it falls in that range. Also, consider that the rocks of the seafloor, the oceanic crust, have almost no quartz at all but abundant amounts of feldspar. So in the Earth's crust, feldspar in the most common mineral.]]></description>
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         <pubDate>2018-10-06 18:52:37 UTC</pubDate>
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         <description><![CDATA[<div>Feldspar</div>]]></description>
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         <pubDate>2018-10-06 18:53:20 UTC</pubDate>
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         <pubDate>2018-10-06 19:03:20 UTC</pubDate>
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