There are approximately 1.5 gallons of blood in an average human body. Average adult has 6 liters of blood (just under 1 and a half gallons), the average child has 1.5 liters, and the average infant has 500 mL of blood. Source(s): I'm a biology major.
Muscovite is another common mica mineral that has a single perfect cleavage similar to biotite and phlogopite. It also occurs in the same igneous and metamorphic rocks that biotite is found in. However, muscovite is much lighter in color than biotite, typically being colorless to white.
Specimens Click to view larger image Biotite Mica Biotite Mica Biotite is a common rock forming mineral, being present in at least some percentage in most igneous and both regional and contact metamorphic rocks.