Why does alexandrite appear to change color in sunlight and artificial light?

Answers:1   |   LastUpdateAt:2012-01-15 04:29:45  

Question
Osmon
Asked at 2012-01-15 04:26:59
Why alexandrite appear to change color in sunlight and artificial light?
Answer1grouseAnswered at 2012-01-15 04:29:45
The origin of alexandrite color change is often attributed to dichroism , but the simple observation shows that the change depends mainly on the nature of the incident light. Alexandrite is a gemstone that trichroic absorbs and reflects light differently in each of its three optical directions . Spectroscopic analysis reveals a different absorption spectrum for each of the three optical directions . The differences in absorption of different colors because it looks when viewed from different directions relative to the crystal structure. However, there is the trichroism which is responsible for remarkable color change . The phenomenon of color change is the result of the presence of chromium 3 ions and how they absorb and reflect light. Daylight contains a high proportion of green and blue light and incandescent lighting contains a higher balance of red light. When the light is balanced ( daylight ), the rock is green , but when the light source is reddish (incandescent ), the rock is red. Human vision is more sensitive to green light . Alexandrite reflects both green and red light . Daylight , a greater proportion of green light reflected what we see green. By contrast, incandescent light is reflected more red light we see red.
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