ORDER vii. PRISMATIC CHIIYSOL1TE. 345 



with hexahedral Silver. Beautiful crystals are met with 

 in the veins of various places near Bourg d'Oisans in Dau- 

 phiny, at Bareges in the Pyrenees, in Savoy, in the county 

 of Gomor in Hungary, and in large well defined crystals 

 at Botallack in Cornwall. In the latter place it is found in 

 a massive state, and forms a peculiar kind of rock, with 

 dodecahedral Garnet and rhombohedral Tourmaline. It is 

 found, besides, in several places in the Hartz, &c. 



GENUS VIII. CHRYSOLITE. 

 1. PRISMATIC CHRYSOLITE. 



Prismatic Chrysolite. JAM. Syst. Vol. I. p. 117. Man. 

 p. 219. Chrysolite. Olivine. PHILL. p. 95. 96. Kri- 

 solith. Olivin. WERX. Hoffm. H. B. I. S. 429. 437. 

 Chrvsolith. Olivin. HAUSM. II. S. 680. 681. Chrysolith. 

 L.EONH. S. 514. Pe'iidot. HAUY. Traite, T. ILL 

 p. 198. TabL comp. p. 52. Traite', T. II. p. 465. 



Fundamental form. Scalene four-sided pyramid. 

 P = 107 46', 101 31', 119 41'. Vol. I. Fig. 9. 

 R. G. 



a : b : c = 1 : VO'7263 : ^0-6306. 



Simple forms. P QD (P) ; P (p) ; P + QD (s) 

 = 94 3'; (Pr I) 3 (e) ; (Pr + oo) 3 (n) 

 = 130 ff; (Pr + QD) 3 (z) = B6 26'; Pr 1 

 (fc) = 119 12'; Pr (Ar) = 80 53'; Pr (d) 

 = 76 54 r ; j?r + oo (T) ; Pr + oo (M). 



Char, of Comb. Prismatic. 



Combinations. l.Pr. (Pr I) 5 . (Pr-f- oo) 3 . Pr-f oc. 



2. Pr.(Pr l) 3 .P.(Pr+ oo) 3 .(Pr+ c).Fig.20. 



3. P x. Pr. (Pr I) 3 . Pr 1. ]?r. P. 

 (Pr + oo) 3 . Pr + QD. Pr -f oo. 



Irregular forms, grains. 



