THE 



PHILOSOPHICAL MAGAZINE 



AND 



ANNALS OF PHILOSOPHY, 



[NEW SERIES.] 



JULY 1828. 



I. On Herderite, a new Mineral Species. By W. Hai dinger, 

 Esq. F.R.S.E.* 



1. General Description. 



FUNDAMENTAL form, a scalene four-sided pyramid, 

 P=141° 16', 77° 20', 116° 3'. (Fig. 1.) Ratio of the axes 

 a : b : c = 1 : s/2'55 : */0-46. 



Simple forms. (P-2) 4 (o) = ,149° 50', ; 



($P-2) 3 (rc) = ,134° 35', ;P(F); (Pr+oo) 5 (0 = 



115° 7'; (P+ oo ) 6 (5) = 42° 58'; Pr (M) = 115° 53'; Pr+ 00 

 (r); Pr+ 00 (P). 



Combinations observed. 1. P r •P'(Pr+co) 5 .Pr+oo. 

 (Fig. 2.) 



_2.Pr.{P-2)\($P-2)*.'P.(Pr + oo ) 5 . (P+ 00 ) 6 .Pr+ co. 

 Pr+ 00. 



* Communicated by the Author. 



New Series. Vol. 4. No. 19. July 1828. B Cleavage, 



