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163 Br

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Chemistry CabinetLab Grown Alexandrite, Color changing Mineral, Mineralogy Sample, Rough Gemstone

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Product ID: 33544569

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chemistry cabinet

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About the item

Natural Color Changing Mineral.

What you will receive One 4ml glass vial of natural color changing, lab-grown alexandrite. The alexandrite variety displays a color change (alexandrite effect) dependent upon the nature of ambient lighting. Alexandrite effect is the phenomenon of an observed color change from blueish to purplish with a change in source illumination. Alexandrite results from small scale replacement of aluminium by chromium ions in the crystal structure, which causes intense absorption of light over a narrow range of wavelengths in the yellow region (580 nm) of the visible light spectrum. Alexandrite appears purplish in daylight where a full spectrum of visible light is present and blueish under incandescent light which emits less green and blue spectrum. This color change is independent of any change of hue with viewing direction through the crystal that would arise from pleochroism. Alexandrite from the Ural ains in Russia can be green by daylight and red by incandescent light. Other varieties of alexandrite may be yellowish or pink in daylight and a columbine or raspberry red by incandescent light. Alexandrite 5 carats (1,000 mg) and larger were traditionally thought to be found only in the Ural ains, but have since been found in larger sizes in Brazil. Other deposits are located in India (Andhra Pradesh), Madacar, Tanzania and Sri Lanka. Alexandrite in sizes over three carats are very rare. Today, several labs can produce synthetic lab-grown stones with the same and physical properties as natural alexandrite. Some gemstones falsely described as lab-grown synthetic alexandrite are actually corundum laced with trace elements (e.g., vanadium) or color-change spinel and are not actually chrysoberyl.

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