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	<title>RockHoundBlog &#187; Mineral of the day</title>
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		<title>Pegmatite</title>
		<link>http://rockhoundblog.com/mineral-of-the-day/pegmatite/</link>
		<comments>http://rockhoundblog.com/mineral-of-the-day/pegmatite/#comments</comments>
		<pubDate>Tue, 10 Aug 2010 11:17:06 +0000</pubDate>
		<dc:creator>Gary</dc:creator>
				<category><![CDATA[Mineral of the day]]></category>
		<category><![CDATA[find Pegmatite]]></category>
		<category><![CDATA[mining Pegmatite]]></category>
		<category><![CDATA[Pegmatite]]></category>
		<category><![CDATA[rockhounding Pegmatite]]></category>

		<guid isPermaLink="false">http://rockhoundblog.com/?p=1390</guid>
		<description><![CDATA[A pegmatite is a very coarse-grained, intrusive igneous rock composed of interlocking grains usually larger than 2.5 cm in size; such rocks are referred to as pegmatitic.
Most pegmatites are composed of quartz, feldspar and mica; in essence a granite. Rarer intermediate composition and mafic pegmatites containing amphibole, Ca-plagioclase feldspar, pyroxene and  other minerals are known, [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Pyrite or Foolsgold</title>
		<link>http://rockhoundblog.com/mineral-of-the-day/pyrite-or-foolsgold/</link>
		<comments>http://rockhoundblog.com/mineral-of-the-day/pyrite-or-foolsgold/#comments</comments>
		<pubDate>Mon, 26 Jul 2010 05:16:19 +0000</pubDate>
		<dc:creator>Gary</dc:creator>
				<category><![CDATA[Mineral of the day]]></category>
		<category><![CDATA[Foolsgold]]></category>
		<category><![CDATA[is it gold?]]></category>
		<category><![CDATA[Pyrite]]></category>

		<guid isPermaLink="false">http://rockhoundblog.com/?p=1348</guid>
		<description><![CDATA[The mineral pyrite, or iron pyrite, is an iron sulfide with the formula FeS2.  This mineral&#8217;s metallic lustre and pale-to-normal, brass-yellow  hue have earned it the nickname fool&#8217;s gold because of its  resemblance to gold.  The color has also led to the nicknames brass, brazzle and Brazil, primarily used to refer [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Amphibole</title>
		<link>http://rockhoundblog.com/mineral-of-the-day/amphibole/</link>
		<comments>http://rockhoundblog.com/mineral-of-the-day/amphibole/#comments</comments>
		<pubDate>Thu, 15 Jul 2010 19:23:34 +0000</pubDate>
		<dc:creator>Gary</dc:creator>
				<category><![CDATA[Mineral of the day]]></category>

		<guid isPermaLink="false">http://rockhoundblog.com/?p=1292</guid>
		<description><![CDATA[Amphibole (pronounced /ˈæmfɨboʊl/) defines an  important group of generally dark-colored rock-forming inosilicate minerals, composed of double chain SiO4 tetrahedra,  linked at the vertices and generally containing ions of iron and/or magnesium in their structures. Amphiboles crystallize into two crystal systems, monoclinic and orthorhombic. In chemical composition and  general characteristics they are similar [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<title>Feldspar- Mineral of the day.</title>
		<link>http://rockhoundblog.com/mineral-of-the-day/feldspar-mineral-of-the-day/</link>
		<comments>http://rockhoundblog.com/mineral-of-the-day/feldspar-mineral-of-the-day/#comments</comments>
		<pubDate>Wed, 14 Apr 2010 05:12:56 +0000</pubDate>
		<dc:creator>Gary</dc:creator>
				<category><![CDATA[Mineral of the day]]></category>

		<guid isPermaLink="false">http://rockhoundblog.com/?p=1203</guid>
		<description><![CDATA[Feldspars (KAlSi3O8 &#8211; NaAlSi3O8 &#8211; CaAl2Si2O8)  are a group of rock-forming tectosilicate minerals which make up as much as 60% of the Earth&#8217;s crust.
Feldspars crystallize from magma in  both intrusive and extrusive igneous rocks, as veins, and are also present in  many types of metamorphic rock. Rock formed almost entirely of calcic [...]]]></description>
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		<title>Almandine &#8211; Mineral of the day</title>
		<link>http://rockhoundblog.com/mineral-of-the-day/almandine-mineral-of-the-day/</link>
		<comments>http://rockhoundblog.com/mineral-of-the-day/almandine-mineral-of-the-day/#comments</comments>
		<pubDate>Sun, 21 Feb 2010 21:55:42 +0000</pubDate>
		<dc:creator>Gary</dc:creator>
				<category><![CDATA[Mineral of the day]]></category>

		<guid isPermaLink="false">http://rockhoundblog.com/?p=1169</guid>
		<description><![CDATA[Almandine, also known incorrectly as almandite, is a species of mineral belonging to the garnet Group. The name is a corruption of alabandicus, which is the name applied by Pliny the Elder to a stone found or worked at Alabanda, a town in Caria in Asia Minor. Almandine is an iron alumina garnet, of deep [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>TUFA &#8211; Rock Of The Day</title>
		<link>http://rockhoundblog.com/mineral-of-the-day/tufa-rock-of-the-day/</link>
		<comments>http://rockhoundblog.com/mineral-of-the-day/tufa-rock-of-the-day/#comments</comments>
		<pubDate>Sun, 24 May 2009 05:41:11 +0000</pubDate>
		<dc:creator>Gary</dc:creator>
				<category><![CDATA[Mineral of the day]]></category>

		<guid isPermaLink="false">http://rockhoundblog.com/?p=1108</guid>
		<description><![CDATA[Tufa is a soft, friable and porous calcite rock. It is a calcium carbonate (CaCO3) deposit that forms by chemical/biological precipitation from bodies of water with a high dissolved calcium content. Calcareous tufa is not to be confused with tuff, a hard volcanic rock that is also sometimes called tufa.
Tufa deposition occurs in seven known [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<title>Jasper &#8211; mineral of the day</title>
		<link>http://rockhoundblog.com/regular-postings/jasper-mineral-of-the-day/</link>
		<comments>http://rockhoundblog.com/regular-postings/jasper-mineral-of-the-day/#comments</comments>
		<pubDate>Wed, 16 Jan 2008 18:05:41 +0000</pubDate>
		<dc:creator>Gary</dc:creator>
				<category><![CDATA[Mineral of the day]]></category>
		<category><![CDATA[regular postings]]></category>

		<guid isPermaLink="false">http://rockhoundblog.com/?p=1059</guid>
		<description><![CDATA[Jasper is an opaque, impure variety of silica, usually red, yellow or brown in color. This mineral breaks with a smooth surface, and is used for ornamentation or as a gemstone. It can be highly polished and is used for vases, seals, and at one time for snuff boxes. When the colors are in stripes [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<title>Mineral/rock of the day- Serpentine -California&#8217;s state rock</title>
		<link>http://rockhoundblog.com/regular-postings/mineralrock-of-the-day-serpentine-californias-state-rock/</link>
		<comments>http://rockhoundblog.com/regular-postings/mineralrock-of-the-day-serpentine-californias-state-rock/#comments</comments>
		<pubDate>Mon, 21 May 2007 05:42:33 +0000</pubDate>
		<dc:creator>Gary</dc:creator>
				<category><![CDATA[Mineral of the day]]></category>
		<category><![CDATA[regular postings]]></category>

		<guid isPermaLink="false">http://rockhoundblog.com/?p=1013</guid>
		<description><![CDATA[Overview
Serpentine is said to owe its name either to its serpent-like colours and patterns or from an old belief that the stones were effective protection from snake bites. They have their origins in metamorphic alterations of peridotite and pyroxene. Serpentines may also pseudomorphously replace other magnesium silicates. Alterations may be incomplete, causing physical properties of [...]]]></description>
		<wfw:commentRss>http://rockhoundblog.com/regular-postings/mineralrock-of-the-day-serpentine-californias-state-rock/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Zoisite- mineral of the day</title>
		<link>http://rockhoundblog.com/regular-postings/zoisite-mineral-of-the-day/</link>
		<comments>http://rockhoundblog.com/regular-postings/zoisite-mineral-of-the-day/#comments</comments>
		<pubDate>Wed, 28 Mar 2007 03:53:35 +0000</pubDate>
		<dc:creator>Gary</dc:creator>
				<category><![CDATA[Mineral of the day]]></category>
		<category><![CDATA[regular postings]]></category>

		<guid isPermaLink="false">http://rockhoundblog.com/?p=971</guid>
		<description><![CDATA[
Zoisite is a calcium aluminium hydroxy sorosilicate belonging to the epidote group of minerals. Zoisite is named after the Slovene scientist Baron Sigmund Zois von Edelstein (Žiga Zois), who realized that this was an unknown mineral when it was brought to him by the mineral dealer Simon Prešern, who had discovered it in the Saualpe [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Tanzanite- December&#8217;s birthstone</title>
		<link>http://rockhoundblog.com/regular-postings/tanzanite-decembers-birthstone/</link>
		<comments>http://rockhoundblog.com/regular-postings/tanzanite-decembers-birthstone/#comments</comments>
		<pubDate>Wed, 28 Mar 2007 03:46:51 +0000</pubDate>
		<dc:creator>Gary</dc:creator>
				<category><![CDATA[Mineral of the day]]></category>
		<category><![CDATA[regular postings]]></category>

		<guid isPermaLink="false">http://rockhoundblog.com/?p=966</guid>
		<description><![CDATA[
Tanzanite is the blue/purple variety of the mineral zoisite (Ca2(Al. OH)Al2(SiO4)3) discovered in the Meralani Hills of northern Tanzania in 1967, near the city of Arusha. It is a popular and valuable gemstone when cut, although its durability is somewhat lacking; its tendency to break sometimes precludes appropriate use as a ring stone. Tanzanite is [...]]]></description>
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		<slash:comments>0</slash:comments>
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