I just handed in the frame from Oryx then straight after the 50 Hadium Flakes and other bits required. The only bit left I need to do is kill Mar-Zik the Wizard at Phobos but no quest is showing.
How many fragments do you have? You need 45 for that step to show. It may be something that won't show up until after the daily reset, that happened for me with another quest.