I usually add salt and calcium and magnesium to the water above. I have a high density, my friends call me mafic, my family thinks I am fine grained. Sedimentary rocks fall into 3 major categories. Plants and vegetation under pressure become Bituminous Coal. Use reference tables.
Sedimentary rocks are rocks that form from the accumulation of sediments.
When they cool crystal grow. Crystals are 1mm or less. Can be seen with magnification. Looks like glass. Metamorphic rocks come from all types of rock, igneous, sedimentary and metamorphic rocks.