A largely under-explored, yet critical area of clathrate hydrate research is hydrate metastability and the formation of intermediate structural phases. Our recent computer simulations and Raman/X-ray studies indicate structural transition can occur, where unique cages/intermediate phases can exist. The aim of this proposal is to verify and characterize these intermediate cage types and phases in-situ for the first time. The results can address an important fundamental problem for all gas hydrate energy-related research. Specifically, the objective of this proposal is to characterize the structure and transition of a new intermediate amorphous phase observed in the tert-buty d9-amine/D2/D2O system, utilizing GEM's unique ability to characterize amorphous clathrate environments (intermediate) and crystalline clathrates (beginning & end phases) at 300 & 700 bar, 1kbar at 143K for 16-24h.