Properties of Biotite It is a black mica with perfect cleavage and a vitreous luster on the cleavage faces. When biotite is separated into thin sheets, the sheets are flexible but will break upon severe bending. When held up to the light, the sheets are transparent to translucent with a brown, gray, or greenish color.Click to see full answer. Moreover, what color is biotite?Description and Identifying Characteristics. Biotite and phlogopite are the darkest members of the mica mineral group. Typically brown to black in color, biotite occasionally occurs in a dark green variety. Phlogopite is lighter in color, typically being pale yellow to golden brown.Subsequently, question is, is biotite valuable? Biotite is a common rock forming mineral, being present in at least some percentage in most igneous and both regional and contact metamorphic rocks. Biotite is rarely considered a valuable mineral specimen, but it can accompany other minerals and compliment them. Similarly, does biotite have metallic luster? Biotite, a complex silicate, has a composition of K(Mg,Fe)3(AlSi3)O10(OH)2. Biotite is identified by its non-metallic, shiny luster; dark brown or black color; one perfect cleavage; and thin, elastic sheets. Biotite is a soft mineral.Where is biotite found?Location: Biotite is found in many rocks around the world. Noteable deposits are found in Evje, Norway; Bessnes, France; Uluguru mountains in Tanzania; Ontario, Canada; and Laacher See, Germany.
What is biotite luster?
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