The mineral collection of the Cryolite Company: “Kryolitselskabet Øresund” A/S, Copenhagen, Denmark, contains two specimens labelled “Cryolite, Colorado ?, A and B.” They are about 3 cm. across and consist of a grayish-white, fine-grained mass, the single grains being less than 0.3 mm. in diameter. A specimen much larger than these, about 12 cm. across, but without any label, was found together with other mineral samples, and as it is essentially of the same type as the first-mentioned specimens, it must be assumed that A and B represent fragments of the larger piece. This assumption may be considered quite safe, judging from the singular character of the specimens.

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