Diaspore

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A classic aluminum-containing mineral species from a very old American locality that was so important it was mined up. The diaspore was one of the two chiefly sought after minerals at the site. The diaspore, when deeply violet colored, is the queen of the location. This specimen has some decent color to it, but I have none to compare it to, in person. Note the flatlaying but clearly visible and defined crystals. From the noted W.W. Jefferis (1820-1906) Collection, and note the very early accession number of 1830 in the collection which eventually by the early 1900s numbered over 20,000 specimens.