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The mineral species rich in yttrium-erbium were more particularly sought after because thorium and uranium were not used in the "glower" of the Nernst lamp. The Nernst Lamp Company, a subsidy of Westinghouse, then bought Barringer Hill and began mining, extracting a few hundred pounds of yttria minerals annually for a few years. Eventually ...
A dike of llanite crops out on Texas State Highway 16 about nine miles north of the town of Llano. [3] Llanite, which is similar to granite, is very strong, with a crushing strength of 37,800 lb/in 2 or 26,577,180 kg/m 2. [4] The mineral is also very similar in appearance to pietersite. [citation needed] Modal mineralogy of llanite: [5] quartz ...
While the site is owned by the Texas General Land Office, it was leased to Texas Rare Earth Resources beginning in May 2011 for the exploration and development of the site's rare-earth elements. [15] The United States was the leading producer of rare-earth elements until the 1990s when lower production costs in China caused other mines to close ...
The Texas Gulf Sulphur Company was one of the largest sulfur mining companies in the world from 1919 to 1981. By 1925 the company controlled 40% of the U.S. sulfur market. [ 1 ] It was formed in 1909 and acquired in 1981, after expanding across the United States from Texas into Mexico, Canada, and Ethiopia.
Texas Precious Metals, based in Shiner, Texas, is one of the largest precious metals dealers in the United States. [ 3 ] [ 4 ] The company reported annual revenues of $180.1 million in 2013 [ 1 ] and $153.2 million in 2014. [ 2 ]
In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...
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