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.
Intrusive igneous rock is formed from solidified magma below the surface of the Earth. Intrusive rock exhibits a phaneritic texture, where the individual crystal grains are vi â¦ sible without magnification. Examples of intrusive igneous rocks are granite, diorite, and gabbro. Igneous rocks, which are formed from magma, are furtâ¦. 2  An Introduction to the Mineral Biotite Mica and its Role in Geology Biotite mica is a common rock-forming mineral. 3  It belongs to a large group of minerals that are found in igneous and metamorphic rocks.