Quartz after coesite   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.		UNC sample TS-42 (K. Stewart)
		Rock type qtz-ky-gt-musc schist
		Locality Dora Maira Massif, Parigi, Italy