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Opala
A estrutura interna da opala refrata a luz e em função das condições em que foi formada, pode assumir várias cores. As opalas podem ser claras quase brancas, cinzas, vermelhas, laranjas, amarelas, verdes, azuis, magentas, rosas, verde-oliva, castanhas e pretas. Destas variedades, as opalas negras são as mais raras, enquanto as brancas e as verdes são as mais comuns. Variam, em termos de densidade óptica, de opacas a semitransparentes.
Opal
Opal internal structure makes it diffract light and depending on the conditions of its formation, it can take on many colors. Precious opal ranges from clear through white, gray, red, orange, yellow, green, blue, magenta, rose, pink, slate, olive, brown, and black. Of these hues, the black opals are the most rare, white and greens are the most common. It varies in optical density from opaque to semitransparent.
Opal internal structure makes it diffract light and depending on the conditions of its formation, it can take on many colors. Precious opal ranges from clear through white, gray, red, orange, yellow, green, blue, magenta, rose, pink, slate, olive, brown, and black. Of these hues, the black opals are the most rare, white and greens are the most common. It varies in optical density from opaque to semitransparent.
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