Chapman, Carleton A. Department of Geology, University of Illinois, Urbana, Illinois.
Last reviewed:August 2020
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A relatively large crystal formed in a metamorphic rock. The presence of abundant porphyroblasts gives the rock a porphyroblastic texture. Minerals found commonly as porphyroblasts include biotite, garnet, chloritoid, staurolite, kyanite, sillimanite, andalusite, cordierite, and feldspar.
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