Colored glass: the main component is silicon dioxide, which is smelted from crystal ore at high temperature. It is amorphous, with low hardness, and can also be called molten crystal.
Crystal: The main component is silicon dioxide, which is the purest natural crystal of silicon dioxide in nature. High purity, high transparency and high hardness, but fragile and easily broken.
Agate: The main component is silicon dioxide, which is the natural body of silicon dioxide containing crystal water. Because it contains gum, it has good toughness, is not easy to break and has high hardness.
Diamond: mainly composed of carbon, it is the purest carbon crystal in nature and the hardest substance in nature, but it is fragile and easily broken.