1. 
   Keilhauite
   Keil'hau·ite (kīl'hou*īt) noun (Min.) A mineral of a brownish black color, related to titanite in form. It consists chiefly of silica, titanium dioxide, lime, and yttria.
   Found op http://www.encyclo.co.uk/webster/K/4
   
   
2. 
   Keilhauite
   Keilhauite (also known as yttrotitanite) is a variety of the mineral titanite of a brownish black color, related to titanite in form. It consists chiefly of silicon dioxide, titanium dioxide, calcium oxide, and yttrium oxide. Keilhauite has a chemical formula of (CaTi,Al2,Fe23+,Y23+)SiO5. It differ...
   Found op http://en.wikipedia.org/wiki/Keilhauite
   
   
3. 
   Keilhauite
   Keilhauite is a mineral of a brownish black colour, related to titanite in form. It consists chiefly of silica, titanium dioxide, lime, and yttria.
   Found op http://www.probertencyclopaedia.com/browse/HK.HTM
   
   

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