Why do rocks have patterns in them?

Its because of which type they are further more which year were they made, just like a 'quartzite' its very rare in China and Japan and near countries, rocks may be real or fake, fake ones just break when you drop then 6 ft high, real ones don't break unless by a very stong machine, thats how patterns are created, the first rock was created in 1051, more clearry is created by a change of weather, its its sunny, very sunny, and its starts raining it will create a crackle effect, google other types of effects to know how they are created...