Tridacna is a rare organic gemstone, as white as jade, and is also a sacred object of Buddhism. ?

Tridacna gemstones are made from the shell of the clam Tridacna, which is the largest marine shell. It is a large marine bivalve species with a diameter of up to 1.8m?.

The name Tridacna began in the Han Dynasty. Because there are radial grooves on the surface of the shell, which look like ancient ruts, it is called "car canal". Later generations used it as a car canal because it is as hard as stone. Adding the word "stone" next to it becomes "粗粲".

Chemical composition of clams

1. Chemical composition: Tridacna contains 86.65%-92.57% calcium carbonate, 5.22%-11.21% shell keratin, and 0.69%-water. 0.97%. It also contains trace elements and more than 10 kinds of amino acids.

2. Structure Its minerals are mainly aragonite, which has the same characteristic layered structure as pearls. The outer shell is smooth and bright, and can appear colorful in the sun;

3. Color There are two varieties: white, tooth white and brown and yellow, but the Taichi-shaped variety with tooth white and brown and yellow is the top grade. It features dazzling gold filaments and green intestines.

4. Gloss: Pearl luster.

5. Hardness: Generally 2.5-3, it gradually becomes harder with age.

6. Density: 2.70g/cm?.