Observation of the blister kinds on a shell.

Abstract

Shellfishes tend to contaminate an alien substance in the interior of the body by the same ingredient as a shell. That's caused by a mantle as the organ with which a shellfish makes its shell. A mantle sometimes makes a blister of the various forms with mother-of-pearl layer secretion in both natural and cultured oysters. Those are introduced in "The definition of a pearl and regulation about a nomenclature" (Association of gemological laboratories Japan) and "The pearl standard" (Japan pearl promotion society) etc., and classified as natural blister pearl work, a natural blister, cultured blister pearl work and a cultured blister. Those blister kinds were observed and the differences in the formative process was confirmed this time. This is a report of such observation of soft X-rays pictures and the section of samples.