Azurite, found in Chessy, France. Taken from Photographic Guide to Minerals of the World by Ole Johnsen (Oxford University Press, £17.99, $29.95), originally published in Danish.
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Rocky blues. Nature 418, 129 (2002). https://doi.org/10.1038/418129b
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DOI: https://doi.org/10.1038/418129b