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Madagascar jasper is a variety of jasper highly valued for its beauty and its wide range of colors, which range from green to red, to brown, to gray and black. It is believed that Madagascar jasper formed about 90 million years ago, during the Cretaceous period, through the process of regional metamorphism. The Madagascar jasper mines are located primarily in the Analalava region, in the northwestern part of the island, in deposits of sedimentary, volcanic, and metamorphic rocks.

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