Write the chemical formula that shows the composition for the most common mineral found in rock unit 3.

After studying the photograph above, the chemical formula that will show the composition for the most common mineral that will be found in the rock unit 3 is CaMg (CO3)2. I can't seem to make my keyboard make the numbers smaller. So 3 and 2 should be very small. Sorry about that. I tried to paste the numbers, but it wouldn't let me. 

Connecticut, delaware, maryland, massachusetts, new jersey, new york, new hampshire, north carolina, pennsylvania, rhode island, south carolina, virginia

Master planned communities outside of chicago. note: population density means people living in an area per square mile. chicago, an urban and highly populated area has a much more higher density than a desert, amish community, settlement, or nomadic region.