Natural crystal stone
Crystal is a timely crystal mineral. Its main chemical composition is silicon dioxide, chemical formula is SiO2, alias water mirror, aquamarine and aquamarine.
Well-developed single crystals are hexagonal cones, so they are usually blocky or granular aggregates. Generally, it is colorless, gray and milky white, and it is purple, red, smoky (tea), yellow and green when it contains other mineral elements.
Extended data:
The growth environment of Rock crystal is mostly underground and in caves, which requires abundant groundwater resources, including saturated silica. At the same time, the pressure is about two to three times that of atmospheric pressure and the temperature is between 550 and 600℃.
They grow underground for more than 80 million years, and the crystals will crystallize into hexagonal columnar crystals according to the natural law of "hexagonal crystal system". There are many grains without disorder, all crystal tips point to the center of the hole, and the growth is regular.