The main composition of the quartz stone is selected natural quartz. It's made of 87% quartz crystal and 13% resin and annexing agent.

石英石的主要成分主要是精选的天然石英石，由87%的石英石晶体和13%的树脂和添加剂复合而成。

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For natural, man-made stone craft and refurbishment of the crystal surface, suitable for mining, hotels, Buildings, supermarkets, hospitals, schools and so on.

用于天然，人造石材的晶面工艺与翻新，适用于工矿，宾馆，大厦，超市，医院，学校等。

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This process can be observed in the vibrant colours of the precious stone opal, a natural photonic crystal.

在珍贵的蛋白石中可以观察到这一颜色变化的过程，蛋白石是一种天然的光子水晶。

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The most famous spring is Cleopatra's Bath, which has crystal-clear natural spring water that gurgles up into a large stone pool, and is a popular bathing spot for locals.

BBC: Siwa: An Egyptian oasis