11/23/11

opal

http://en.wikipedia.org/wiki/Opal

Opal's internal structure makes it diffract light; depending on the conditions in which it formed it can take on many colors. Opal ranges from clear through white, gray, red, orange, yellow, green, blue, magenta, rose, pink, slate, olive, brown, and black.



























dif·frac·tion
    noun /diˈfrakSHən/ 
    diffractions, plural

    1. The process by which a beam of light or other system of waves is spread out as a result of passing through a narrow aperture or across an edge, typically accompanied by interference between the wave forms produced

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