Biogenic minerals are minerals produced by living organisms. Two commonly seen biogenic minerals are , which is often produced by coral and other invertebrates, and , which often makes up the shell material of mollusks such as clams.

The preferable words for the fill in the blanks will be -  

Aragonite, calcite

Explanation:

Biogenic minerals are minerals produced by living organisms. Two commonly seen biogenic minerals are  aragonite, which is often produced by coral and other invertebrates, and  calcite, which often makes up the shell material of mollusks such as clams. Biogenic minerals are the mineral substances that are produced by geologic processes. For living organisms, it is their most commonly produced byproduct. E.g; vertebral bones, shells of Oyster, mussel, and clam (aragonite), etc.

Um can u take a picture of the work