Yes, chlorophyll can contain trace amounts of calcium.
While magnesium is the central and most prominent mineral component of chlorophyll, trace amounts of other minerals like iron, calcium, and potassium can also be present. The main role of chlorophyll is to absorb light for photosynthesis. The specific mineral composition can vary depending on the plant species and environmental conditions. Chlorophyll exists in several forms, such as chlorophyll a and chlorophyll b, each having a slightly different structure and absorption spectrum.
