Metamictization (sometimes called metamiction) is a natural process resulting in the gradual and ultimately complete destruction of a mineral`s crystal structure, leaving the mineral amorphous. Affected material is therefore described as metamict. Certain minerals occasionally contain interstitial impurities of radioactive compounds and it is the....
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http://en.wikipedia.org/wiki/Metamictization
(from the article `industrial glass`) ...for instance, by a shock wave during an impact), or it may be converted by irradiation with high-energy subatomic particles. The former type are ...
Found on
http://www.britannica.com/eb/a-z/m/78
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