1. 
   Knockstone
   Knock'stone` noun (Mining) A block upon which ore is broken up.
   Found op http://www.encyclo.co.uk/webster/K/16
   
   
2. 
   knockstone
   <chemical> A block upon which ore is broken up. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?knockstone
   
   
3. 
   Knockstone
   • (n.) A block upon which ore is broken up.
   Found op http://thinkexist.com/dictionary/meaning/knockstone/
   
   

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