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March-April 2015

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Mineral Mysteries: Skunks: A Mystery Solved?

In his Mineral Mysteries column in the July/August 2013 issue of Rocks & Minerals (pages 368–372), John White discussed “skunks,” calcite crystals with stripes of other minerals (usually) aligned along their edges. The cover of the March/April 1997 issue of Rocks & Minerals, which features his figure 1, is reproduced here as this article's figure 1. Particularly mysterious, he writes, are rare examples of calcite with strings of other minerals running from the tip of the crystal down the middle of the crystal faces. He points out correctly that there is nothing special about the middle of a face that would attract overgrowths to it more than to other parts of the same face.

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