Rainbow Quartz

Rainbow Quartz
We name the rainbow quartz for there are rainbows include in the quartz.
There are several reasons why rainbows appear inside crystals.
One reason is that crystals experience significant pressure during their growth (due to changes in the Earth's crust), resulting in internal cracks and special light refraction, leading to the appearance of rainbows.
The second is that when natural crystals are formed, there are occasional differences when the crystals overlap and grow, resulting in the refraction of light, which is also a rainbow.
Thirdly, during the formation of the inner veins of white crystals, other minerals invade and form inside.