According to the Perceived Service Quality model (Figure 1), the quality of a service, as perceived by the customer, is the result of a comparison between the expectations of the customer and his or her real-life experiences.
Resorption of garnet I may have occurred either as a result of the prograde univariant reaction Grt + Chl + Ms = St + Bt + Qtz + H2O, or during decompression, by the net transfer reaction Grt + Ms + H2O = St + Bt + Qtz, before staurolite had become unstable.
Beryllium, aluminum, silicon and oxygen crystallize out of the felsic magma to form the mineral beryl. Emeralds happen when enough chromium, vanadium and iron have dissolved out of mafic rocks to give those beryl crystals a deep rich green color. Synthetic emeralds. Natural emerald formation is a wonderful but messy process.