When a normal crystal grows, it is often found that the growth line is parallel to the cylinder tip line. Because of the small growth space in underground and caves, especially in the event of earthquakes or crustal changes, they are even easily squeezed by other minerals, and different "crystal planes" often appear. Also, when crystals are still in liquid state, they are often wrapped by other minerals and marls and grow together, such as rutile (which will become crystals later), volcanic marls (which will become phantom crystals later) and so on.
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The cotton body or cloud body of rock crystal is aimed at transparent crystal, that is, its interior should be transparent but it looks opaque, and it has a foggy feeling or a feeling that there is cotton wool in it. The most common ones are white crystal ball, crystal column, amethyst and titanium crystal. Cotton or clouds are naturally formed and will not gradually disperse after wearing for a period of time.
Crystal stone is also called quartz stone. The oldest name in China is "Shuiyu", which means jade like water. In Buddhist books, crystal clear and bright crystal is called "watery spirit". It is believed that crystal will flash magical light and can be used by all beings, and it is honored as "Bodhisattva Stone".
The crystal is crystallized in a natural environment with a certain temperature and pressure, and its composition is silicon dioxide. Most of the colors are colorless and transparent (purple, brown, green, gold filiform, coral and other different forms are formed when a small amount of impurities are mixed in the crystallization process due to environmental changes), the hardness is about 6-8, and the melting point is 17 13℃. Pure natural crystal is the best optical material.