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Andalusite is a yellow, green, or brown-red gem that displays strong pleochroism, which means that it will reveal these different colors as the observer changes his viewing angle. Often, the red and the green colors may be seen simultaneously. Andalusite does exist in a cat’s-eye variety, but only very rarely. Andalusite is named for Andalusia, the province of Spain in which it was first discovered. Andalusite is a material used in the manufacture of spark plugs, and as it is fairly unknown as a gem, the price for one or two carat pieces can be quite inexpensive.
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