onDER vii. PRISMATIC GADOLIXITE. 371 



iii France it occurs in amygdaloid. In Ceylon, in France, 

 at Ellin in Bohemia, at Ohlapian in Transylvania, &c. 

 pyramidal Zircon occurs in the sand of rivers ; it is com- 

 monly found with the native Platina. Among the residue 

 from the gold stream works in Transylvania, they are fre- 

 quently of a white colour ; but there are likewise bright 

 hyacinth-red ones of the elegant form (P) 3 . [P -f co], the 

 eight-sided pyramid not being modified by any faces conti- 

 guous to its apices. Similar varieties are found among the 

 Scorza, or arenaceous Epidote (prismatoidal Augite-spar) 

 from M uska on the Aranyos in the same country. They 

 are very small. 



5. Pyramidal Zircon is used as a gem, but of no high 

 value. Several varieties from Ceylon used formerly to 

 be called Jargon de Ceylon, and sold as an inferior kind of 

 diamonds, on which account they were denominated Jar- 

 goon of diamond. 



GENUS XIII. GADOLINITE. 

 1. PRISMATIC GADOLINITE. 



Prismatic Gadolinite. JAM. Syst. Vol. I. p. 170. Man. 

 p. 231. Gadolinite. PHI LI., p. 105. Gadolinit. 

 WERN. Hoffm. H. B. III. 2. S. 303. Gadolinit. 

 HAUSM. II. S. 608. Gadolinit. LEONH. S. 500. 

 Gadolinite. HAUY. Traite', T. III. p. 141. Tabl. 

 comp. p. 47. Traite', 2de Ed. T. II. p. 440. 



Fundamental form. Scalene four-sided pyramid. 

 P = 156 55', 111 6', 73 44'. Inclination of 

 the axis = 0. Vol. I. Fig. 41. HAUY. 



a:b:c:d=l:4:V2:0. 



Simple forms. r (0 = 156 55'; (Pr -f oo) 5 

 (M) = 109 28'; (? + oo) 4 (u) = 70 



