Related knowledge expansion:
In some places, tiger skin color is also called tiger skin liver stone (green stone). Biscite refers to chalcedony containing mineral impurities such as clay minerals and iron oxide, also known as liver stone, and its impurity content is often above 15%. Because the texture is not pure.
Usually opaque or slightly transparent, the luster is slightly darker than ordinary chalcedony. Bishi is rich in colors, including red, green, white and yellow.
In addition to monochrome varieties, variegated varieties are also common. When there are more than two colors in tourmaline to form various strip-like or landscape-like patterns, it is collectively called "picture tourmaline", and this kind of tourmaline is mostly directly used as an ornamental stone.
In particular, Jasper and Aquamarine were designated as the birthstone of March, symbolizing calmness, courage and wisdom.