Opal
opal is not a crystal ,instead it's made up of tiny spheres,these spheres are most often composed of sillica with about the same chemical composition as quartz.
when the spheres line up in rows,stacked like ping pong balls in a box,light waves bend around the spheres and break up into spectral hues.the size of the spheres and the way interacts with them determine the colors the opal displays,red is the most desirable.
the finest quality opals have black bodycolor emblazoned with large and distinct patches of many diffrenet intense bright colors.
In any opal,large patches and color are preferred over smaller ones without black areas.
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