Mineral Processing Technology : April 2016 · There has been considerable discussion related to banning the use of cyanide in the world. Often NGOs and the news media report these so-called bans to suggest there is a widespread negative view of cyanide by the public …
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OPAL (SiO2•nH2O): Rainbows in a Rock Not a mineral, not a rock, opal is a geologic entity quite unique among mineraloids: it can contain up to 21% weight percent water. As such, it is possibly more correct to consider it as a frozen gel, but even that is confusing and inaccurate.