Arsentsumebite

M

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Block of tabular azurite crystals (the largest measuring 2.2 cm) covered on one side with elongated cylindrical groups made of emerald green microcrystals of arsentsumebite creating a beautiful contrast. The arsentsumebite results from an epimorphous growth on mimetite that was dissolved at a later stage. This is one of the best known samples of this rare mineral, which is both arsenate and sulphate.