a mineral. Also known as "stone marrow". Chalcedony is actually a kind of aphanitic substance of Shi Ying and SiO2 _ 2, which is a variety of Shi Ying. It is produced in the form of breast or bell-milk, often in the form of kidney, milk, grape, etc. Wax-chalcedony is formed under the conditions of low temperature and low pressure, and appears in cavities, hydrothermal veins, hot spring deposits, clastic deposits and weathered shells of ejected rocks. Some chalcedony tuberculosis will contain water and bubbles, which is very interesting. Its physical properties are the same as those of Shi Ying. Chalcedony is regarded as a gem, mainly used as a material for arts and crafts. That is, the jade paste contained in ancient books. Taoism says that obedience can become immortal. White as jade. Sweet name. Yu wine. One of the seven treasures of Buddhism. 6. The representative variety Jinshui Bodhi. One of the oldest jade varieties in human history. China appeared as an ornament in the Neolithic age, and it has been continuous since then. Main chemical composition: SiO 2; May contain Fe, Al, Ti, Mn, V and other elements. Crystallization state: aphanitic aggregate, dense and massive, or spherical, radial or fine fibrous aggregate.