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 Trento Province in Italy, Geological Occurrence Gehlenite is found in carbonaceous chondrites from which it condensed as a refractory mineral in the hotter stages (FU Ori) of the presolar nebula , and is found in diorite intruded carbonate rocks, and to a far lesser extent in uncompahgrites, melilitites,… (More on Gehlenite)