The chemical contents in the sand quartz has reached national standards of silicon raw material for plate glass production after combined treating by magnetic separation plus diluted acid dipping.

采用磁选分离法+稀酸浸泡法联合处理后，使该地石英砂的化学成分达到了优质的生产平板玻璃用硅质原料的国家标准。

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Until recently, however, Silicon Valley did not take much interest in the alternative use of its principal raw material.

然而，直到近几年，硅谷（电子科技产业中心）才开始对这种基础天然物质的其他用途产生兴趣。

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One problem for the emerging technology is cost, even in the aftermath of a sharp fall in solar panel prices, following a global glut of the main raw material, solar-grade silicon.

这种新兴技术的难点就是成本，即使太阳能板的价格大幅下跌，随之而来的问题就是稀有材料太阳级多晶硅在全球供不应求。

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Take Sharp, which since 2000 has led the world in solar panels sold (it dropped to No. 2 last year in the midst of a silicon raw-material shortage).

FORBES: Magazine Article

Silicon, the major raw material used in the manufacture of solar panels, requires an energy-intensive process to turn it into solar-grade silicon.

FORBES: U.S. Solar Manufacturer to U.S. Taxpayers: Drop Dead

In 1931 American chemical engineer Samuel Kistler invented the lightest known solid--an aerogel--by drying a form of silicon dioxide (a raw material for glass) under intense pressure and high temperature.

FORBES: Magazine Article