Pyrophanite, a member of the ilmenite group. Pyrophyllite is an early stage metamorphic mineral and is actually quite common although usually not very abundant as good mineral specimens. It is found as a constituent of slate, phyllite (which is not named after pyrophyllite), some schists and other early stage metamorphic rocks. It is most common in the phyllites were its pearly luster helps give the phyllites their well known shiny luster. Other minerals that contribute to the luster of phyllite include the micas, sericite, chlorite, graphite, quartz and epidote.