Forsterite
Forsterite crystallizes in the orthorhombic system ( space group "Pbnm" ) with cell parameters "a" 4 . 75 Å ( 0 . 475 nm ) , "b" 10 . 20 Å ( 1 . 020 nm ) and "c" 5 . 98 Å ( 0 . 598 nm ) . 
<triplet> Forsterite <subj> orthorhombic <obj> crystal system