The mineral creedite was first found by Esper S. Larsen in the fluorite mines of Wagon Wheel Gap, Creede Quadrangle, Colorado, and described by Larsen2 and Wells as a new mineral species of the composition CaSO4 · 2CaF2 · 2A1(F,0H)3 · 2H20. Later, better material was obtained and the mineral further investigated by the present writer3 confirming the composition as found by Wells and determining the crystal symmetry and elements. The mineral was found to be monoclinic. Several crystal habits were found, all prismatic but differing somewhat in the relative sizes of the terminal faces. The mineral is associated with fluorite or embedded in a white halloysite clay.

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