Difference between revisions of "Shell composition"
| Line 6: | Line 6: | ||
** with calcareous cement | ** with calcareous cement | ||
* secreted calcium carbonate (calcite or aragonite) | * secreted calcium carbonate (calcite or aragonite) | ||
| − | + | ** microgranular | |
| − | + | ** porcellaneous | |
| − | + | ** hyaline | |
* secreted ???silica (very uncertain) | * secreted ???silica (very uncertain) | ||
