Firstly we have the crocidolite, considered by many people as the most dangerous mineral in the world because it causes very several diseases like lung cancer or mesothelial cancer. It is used to make tilings and roof tiles.
Later we have the erionite. It belongs to the group of the zeolites. It is very dangerous because with direct exposure it causes a very strange cancer named mesothelioma. You can find it in the place where the volcanic ash is modificated by groundwaters and weathering.
Thirdly, we have the fenaquite. This mineral contains beryllium, a very toxic mineral that causes lung cancer and other strange diseases like the berylliosis or the chemical pneumonitis. It is used to make alloyds for computer and telecommunications equipment. You can find it in Colorado (U.S.A), Zimbaue, Norway, Burma, Brazil and Madagascar.
Finally, we have the potassic feldspar. It contains small amounts of radioactive uranium that forms radon gas. It causes a several lung cancer. It is used to make glasses and ceramics and you can find it in a lot of places like the U.S.A, Brazil. China or Spain.
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