1. 
   gehlenite
   mineral composed of calcium aluminum silicate, Ca2Al2SiO7, one end-member of the melilite mineral series (see melilite).[1 related articles]
   Found op http://www.britannica.com/eb/a-z/g/15
   
   
2. 
   Gehlenite
   Gehlenite, (Ca2Al[AlSiO7]), is a sorosilicate, Al-rich endmember of the melilite complete solid solution series with akermanite. The type locality is in the Monzoni Mountains, Fassa Valley in Trentino in Italy, and is named after Adolf Ferdinand Gehlen by A.J. Fuchs in 1815. ==Geological occurrence...
   Found op http://en.wikipedia.org/wiki/Gehlenite
   
   

Tip: double click on a word to show its meaning.