Millet perela ke liperela tse hloekileng tsa tlhaho. Liperela ke lejoe la khale la tlhaho, le fumanehang haholo ho perela oyster le 'm'a-oa-pearl molluscs. Liperela ke lifaha tsa liminerale tsa calcium carbonate tse hlahisoang ke endocrine system ea shellfish, e entsoeng ka likristale tse ngata tse nyane tsa aragonite. Li hlaha ka mefuta e mengata e fapaneng ea libopeho le mebala.
