The occurrence of molybdenite (MoS2) at Crown Point, Chelan county, Washington, is one of the most interesting in the United States for several reasons: First, because practically the entire commercial supply of the mineral in the United States for 1902 was mined at this locality. The amount is given by Dr J. H. Pratt as about twelve tons of ore.* Second, because the locality presents an interesting illustration of the geologic relations of the substance; and third, because so large a quantity of this comparatively rare mineral naturally furnishes excellent specimens representing the mineralogical character of molybdenite.

Commercially molybdenite is important as the chief source of molybdenum. This element has long been used as a pigment for coloring silk, leather, and porcelain. The color which it furnishes is a brilliant, uniform, and permanent blue, and is especially prized for glazed ware. Molybdenum finds a limited use in chemical laboratories . . .

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