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.
Report Abuse. some minerals only occur in metamorphic rocks b/c of compounds relentless need to stay stable. When heat and pressure increase certain elements in certain minerals can no longer keep there properties and thus break off into a different state.elevance. Rating Newest Oldest. Best Answer: Because they are formed by heat and pressure. Igneous rock is formed by volcanos and the lava that flows out hardens and turns into igneous rock Sedimentary is layers of differents kinds of dirt that pile up with pressure.