Abstract
Information regarding this mineral is confined to the paper of Solly (1903). The author measured two crystals and from the gnomonic plot of one of them discovered a typographical error in Solly’s original statement of the axial ratio. This error did not affect the values of his angles but it has gone into every printed description of the mineral. Since no complete two-circle angle table has been published for baumhauerite, one has been calculated and the angles for the more important forms are given below; 118 forms are listed by Solly whose position and elements (corrected) have been used. The mineral is characterized by the enormous development of the orthodome zone to which belong two-thirds of the observed forms.
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