Is Dorothy bear a crystal?

Crystal is a rare mineral, a kind of gem, and a timely crystal, which belongs to the timely family in mineralogy. The main chemical composition is silicon dioxide, and the chemical formula is SiO2.

When pure, colorless and transparent crystals are formed. When containing trace elements such as aluminum and iron, it is pink, purple, yellow and brown. After irradiation, trace elements form different types of color centers and produce different colors, such as purple, yellow, brown and pink. Minerals containing associated inclusions are called inclusion crystals, such as hair crystal, green ghost, red rabbit hair and so on. Inclusions include rutile, tourmaline, actinolite, mica and chlorite.

Crystal refers to colorless and transparent silicon dioxide crystal, which belongs to precious minerals. At present, it ranks with chalcedony and tourmaline in the category of colored gems, with less output. It was called "water jade" and "water essence" in ancient times.

Quote "Zi Tong Zhi Jian Han Gao Zufu Two Years at the End of Jin Dynasty": "The Lord of Fujian built Wei Zi Palace, decorated with crystals." "The ancient and modern novel Li Gongzi was satisfied with saving the snake": "The utensils are all made of glass, crystal, amber and agate, which are unique and not owned by the world." Preface to < Selected Poems of Ai Qing >: "Meditate on the shape of flower dew and love the quality of crystal."