1. 
   Greisen
   Greisen is a highly altered granitic rock or pegmatite. Greisen is formed by autogenic alteration of a granite and is a class of endoskarn. Greisens appear as highly altered rocks, partly coarse, crystalline granite, partly vuggy with miarolitic cavities, disseminated halide minerals such as fluori...
   Found op http://en.wikipedia.org/wiki/Greisen
   
   
2. 
   greisen
   [n] - a granitic rock composed of quartz and mica
   Found op http://www.webdictionary.co.uk/definition.php?query=greisen
   
   
3. 
   Greisen
   Grei'sen noun (Min.) A crystalline rock consisting of quarts and mica, common in the tin regions of Cornwall and Saxony.
   Found op http://www.encyclo.co.uk/webster/G/57
   
   
4. 
   greisen
   <chemical> A crystalline rock consisting of quarts and mica, common in the tin regions of Cornwall and Saxony. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?greisen
   
   
5. 
   Greisen
   • (n.) A crystalline rock consisting of quarts and mica, common in the tin regions of Cornwall and Saxony.
   Found op http://thinkexist.com/dictionary/meaning/greisen/
   
   
6. 
   greisen
   modification of granite, an intrusive igneous rock; it consists essentially of quartz and white mica (muscovite) and is characterized by the absence ...
   Found op http://www.britannica.com/eb/a-z/g/70
   
   
7. 
   Greisen
   Greisen is a crystalline rock consisting of quartz and mica, common in the tin regions of Cornwall and Saxony.
   Found op http://www.probertencyclopaedia.com/browse/HG.HTM
   
   
8. 
   greisen
   1) A granitic rock composed of quartz and mica 2) Rock 3) Stone
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/greisen/1
   
   

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