The growth of the literature on the subject of allochromatic coloring in minerals is but another indication of the trend of mineralogical research away from a mere recording of physical and chemical properties to the more fundamental and more fascinating study of the causes for the observed phenomena. A survey of that literature, however, shows that the work done on the subject has been largely of a general nature. Investigators have studied one or two specimens each of many minerals, rather than a large number of specimens of one mineral. The result is that for most allochromatic species the question of what causes their color is an open one, whose solution is only inferred.

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