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Silica
...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) - 13:41, 13 November 2008
Vetrofond
|quartz grey

11 KB (1,378 words) - 08:48, 7 February 2011
Effetre
|rose quartz

13 KB (1,846 words) - 10:50, 18 February 2011
CiM
|rose quartz

13 KB (1,982 words) - 11:03, 18 February 2011

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