FRESH COMMON FELSPAR. 371 13. The preceding variety, in which the edges form ed by the meeting of the other bevelling planes with the broader lateral planes, are truncated *. 14. In all the preceding varieties from N° 9. the pro per edge of the bevelment is sometimes trun cated ■}*. 15. The smaller bevelling planes in N° 11. some times disappear, whilst the truncating planes on the angles become larger, and forni with tho larger bevelling plane a new and much more acute bevelment, fig. 97 J. When two bevelling planes in variety 9. become very large, as in N° 2. whilst the prism becomes very broad and short, so that these two large bevel ling planes approach near to each other, and in crease in equal proportion with the broader la teral planes with which they meet under a right angle, they form with these A rectangular four-sided prism, in which the smaller lateral planes of the six-sided prism form a kind of oblique bevelment on the terminal planes, and which is variously modified by the remains of the smaller bevelling planes of the fundamental figure, and the other planes of al teration ||. 17. The preceding figure truncated on the lateral edges. A a 2 These * Those truncating planes, along with some others, occur in Hauy’s c dspath synoptique and Feld'path dccidodeeaedre. + This transition is to be seen in Unuy's Feldspath npophanc and Feld- B Path synoptique. 4 As in IIaiiy’s Feldspath dccidodeeaedre. II Vid. Hatty, fig. 91. and 9g, Jloini dc Lisle assumed this os the fun- ’hontai form of felspar.