User talk:Twang
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Commons picture of the day
Cassiterite bipyramids, chemical formula SnO2. locality Southeast slope Xuebaoding, Pingwu country, province Sichuan in China. Edge length ca. 30mm. Collection M.R.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/69/Cassiterite.jpg/245px-Cassiterite.jpg)
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