Most of them are underground, in caverns, there needs to be abundant groundwater sources, groundwater contains saturated silica, and the pressure needs to be about two to three times the atmospheric pressure, and the temperature needs to be between 550-600 °C.

In general, in an ideal environment controlled by humans, that is, when the physical and chemical conditions are all in line with the above conditions, the growth rate of crystals is about 0.8 millimeters (mm) per day. This is also the standard production speed in many laboratories and factories of artificial crystals. The crystals thus cultivated are the so-called “synthetic quartz”, which are usually cut into chips for use in the electronics, computer and communication industries. It is also called “cultivated quartz” (cultured quatrtz), although it uses different terms, but it actually refers to the same thing. Generally, the thickness of artificial crystal for industrial use is about three centimeters, that is, 30mm, and it takes about 40 days to grow; If it is used for the jewelry industry to grind into crystal balls of more than 10 centimeters (100mm), it usually takes about 120~180 days. However, this is only possible in the most ideal environment under human control, and in nature, the situation is not so optimistic, because the conditions of raw materials, water quality, temperature, pressure, etc. are constantly changing, and it is difficult to achieve the ideal situation, which usually takes tens of thousands of times, or millions of times, to achieve the same growth. This is why the “geological age” movement is calculated based on “million years”, which is also the reason why “natural crystal” is precious.

When normal crystals are growing, growth lines parallel to the ridge line at the tip of the cylindrical shape can be found. Due to the narrow growth space in the underground and caverns, especially in the event of earthquakes or crustal changes, it is even easy to be squeezed by other ores, which often compresses and produces different “crystal planes”. In addition, when the crystal is still in a liquid state, it is often coated with other ores and marls to crystallize and grow, such as rutile (later turned into crystals), volcanic marl (later turned into phantom crystals), and so on. All of these are “part of nature” and should not be regarded as “blemishes”.

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