Final answer:
Phlogopite and biotite are both micas, but they have differences in color, composition, and melting point.
Step-by-step explanation:
Phlogopite and biotite are both micas, but they have some key differences. Phlogopite is a brown-colored mica, while biotite is a dark black or brown mica. Phlogopite typically contains higher amounts of iron and magnesium than biotite.
Additionally, phlogopite has a higher melting point than biotite.