變質相的定義：


                      示意圖（分界線的位置會有誤差）：

                                Temperature
    ____________300_____________450__________625________800____________
   |             | Albite-epidote|  Hornblende|  Pyroxene | Sanidinite
   |             |   hornfels    |   hornfels |  hornfels________------
P  |            | ----------------------------------------
r  |     Zeolite|        |  |    |                |
e  5     ___--+- PX    |    |    |                |
s  |-----     |      |      |    |                |
s  |           |    |Green-  |    |                |    Granulite
u  |            |  | schist   |E-A |  Amphibolite   |
r  |             +-            |    |                |
e 10              |             |    |               |
   |               |             |    |              |
   |                +------------------------________|______
k  |                 |                                      ------______
b  |    Blueschist    |
b 15                   |                    Eclogite
r  |                    |
   |                     |
   |                      |


PS PX=Prehnitepunpellyte                E-A=Epidote-amphible