1. 
   slate pencil
   [n] - a pencil of soft slate (or soapstone) used for writing on a slate
   Found op http://www.webdictionary.co.uk/definition.php?query=slate%20pencil
   
   
2. 
   slate pencil
   noun a pencil of soft slate (or soapstone) used for writing on a slate
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=slate%20pencil
   
   

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