Vitrain is a type of coal. Its combustion leads to ash containing extractable levels of germanium compounds such as germanium dioxide. ...
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http://en.wikipedia.org/wiki/Vitrain
(from the article `coal`) Vitrain (Glanzkohle or charbon brillant), which is characterized by a brilliant black lustre and composed primarily of the maceral group vitrinite, ...
Found on
http://www.britannica.com/eb/a-z/v/31
vitrain 1. A narrow glassy band found in bituminous coal. 2. A coal lithotype characterized by a brilliant, glassy appearance, jet-black color, cubic cleavage, and conchoidal fracture; a component of bonded coal; pure coal.
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http://www.wordinfo.info/words/index/info/view_unit/2316/
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