https://quatangthanhdat.com/ky....-niem-chuong-thuy-ti
Quartz crystal is one of the most common minerals in the Earth’s continental crust. It is made of silicon and oxygen in a crystal structure that can be clear or contain inclusions, veils and bubbles. Quartz crystal is a very important material for electronic and optical applications. Its piezoelectric properties allow it to vibrate at precise frequencies that are used in clocks, radios and other devices. It is also useful in making silicon chips for computers, televisions and other electronic devices. The high-quality optical-grade
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