1. 
   Petrosilex
   Pet`ro·si'lex noun [ Petro + silex .] (Min.) Felsite.
   Found op http://www.encyclo.co.uk/webster/P/67
   
   
2. 
   petrosilex
   <chemical> Felsite. ... Origin: Petro + silex. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?petrosilex
   
   
3. 
   Petrosilex
   • (n.) Felsite.
   Found op http://thinkexist.com/dictionary/meaning/petrosilex/
   
   

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