Andalusite is an aluminosilicate mineral with columnar crystals, gray or light red colors and square cross sections. Generally occurs near the contact surface between argillaceous rocks and granite intrusions. Some andalusite captured some carbon during crystallization, and it was black cross-shaped in cross section. This andalusite is called "kyanite". The beautiful and transparent andalusite can be used as a gem. Gem-grade andalusite is mainly produced in Brazil, and the largest one weighs 80 carats.
Another chrysanthemum stone is produced in yong he zhen, Liuyang County, Hunan Province. The chrysanthemum stone at the bottom of Liuyang River has a gray-black bottom, and there are various white chrysanthemum lines in the stone, which looks like chrysanthemums in bud. The local people made it into crafts such as inkstone, vase, hanging screen and rockery, which was elegant, simple and interesting. 19 15, the chrysanthemum stone hanging screen made by Liuyang won the gold medal at Panama International Expo, and Liuyang chrysanthemum stone carving has been famous at home and abroad since then.
The stamen of Liuyang chrysanthemum stone is flint, and the petals are the aggregate of radial celestite (strontium sulfate) or calcite (calcium carbonate). There are 4 ~ 7 layers with flowers. The lithology is marl.
There is also a chrysanthemum-shaped rhyolite, in which the "chrysanthemum" is naturally formed by the hairlike crystallite minerals in this rock. Chrysanthemum rhyolite was found in Xinglong County, Hebei Province and Chiwu Village, Anji County, Zhejiang Province.