Page:Transactions of the Geological Society, 1st series, vol. 1.djvu/399



TABLE OF THE MODIFICATIONS OF THE PRIMITIVE CRYSTAL OF BARDIGLIONE.

According to the determination of it by Abbé Haüy

''Primitive Crystal. A rectangular tetrahedral prism, the terminal faces of which are rectangles, the sides of which are in the ratio 16 to 13,4, and the height of which is yet unknown.''

As the determination of the primitive crystal of bardiglione offers some difficulties, with respect to which I have felt myself obliged to differ from the Abbé Haüy, whose decisions are of great weight in this science; and as it is very possible that I may be mistaken, I have given above, the calculations of the same modifications as in the preceding table, but on the supposition that the bases of the primitive prism of this substance are rectangular,