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- ...nown for being a very hard substance. It is most commonly found in sand or quartz and is the main ingredient in glass. Silica is also the main component of m ..., it is important to understand whether the silica is crystalline (such as quartz) or amorphous (non-crystalline).2 KB (307 words) - 12:41, 13 November 2008
- |quartz grey11 KB (1,378 words) - 07:48, 7 February 2011
- |rose quartz13 KB (1,846 words) - 09:50, 18 February 2011
- |rose quartz13 KB (1,982 words) - 10:03, 18 February 2011
