Abstract
Crystals of shortite, named after Professor M. N. Short of the University of Arizona, were found in cores of clay shale from Sweetwater County, Wyoming, at depths between 1258 and 1805 feet. The crystals, several millimeters thick, are orthorhombic, hemi-morphic, with the axial ratio a:b:c=0.455:1:0.648. The indices of refraction are: α = 1.531, β= 1.555, γ = 1.570, 2V is negative, 75°. Axial plane is {100} with the c axis the acute bisectrix. Analyses of two types of crystals give the formula, Na2O · 2CaO · 3CO2.
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