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.
Another kind of intrusive rock is pumice which forms from granitic lava. This kind of lava is lighter colored, less dense and composed of silicon and oxygen. Pumice cools off very quickly and also is associated with gaseous eruptions. Therefore, pumice is very lightweight, and has very small crystals. Some pumice will float in water.