This is a photomicrograph of a high-pressure schist from the famour Dora Maira massif in Italy. The region of coarser-grained quartz in the upper center portion of this photomicrograph was probably originally occopied by coesite, the high-pressure polymorph of quartz. Metamorphic rocks from the Dora Maira Massif show other evidence of being exhumed from EXTREMELY deep levels in thickened crust (>28 kbar), including...

* ellenbergerite inclusions in garnet

* coesite inclusions in garnet

UNC sample


(K. Stewart)

Rock type

qtz-ky-gt-musc schist


Dora Maira Massif, Parigi, Italy