Retrieving "Mafic Constituent" from the archives

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1. Biotite

   Linked via "mafic constituent"

   Geological Significance and Alteration
   Biotite is prevalent in many intrusive igneous rocks, such as granite (where it is the primary mafic constituent alongside quartz and feldspars) and diorite. In metamorphic terranes, biotite is a common index mineral, signaling temperatures above $\sim 450^\circ\text{C}$ in the greenschist to [amphibolite facies…