View source for Shell composition

There are three basic types of foraminiferal tests:

* organic-walled
* [[agglutinated]] (cemented foreign particles/grains)
: - with organic cement
: - with calcareous cement
* secreted calcium carbonate (calcite or aragonite)
: - microgranular
: - porcellaneous
: - hyaline
* secreted ???silica (very uncertain)