96 PHYSIOGRAPHY. 



EUDIALYTE. 



SPAR. 



Eudialyte. JAM. Man. p. 322. Eudyalite. PHILL. p. 122. 



Fundamental fqrm. Rhombohedron. R 73 

 24'* Vol. I. Fig. 7. WEISS. 



a ^ J 13-5. 



Simple forms. R oo (o) ; R 2 (*) = 126 

 13' ; R 1 = 84 16'; R (P) ; R + OD (c) ; 



P + QD (U). 



Char, of Comb. Rhombohedral. 



Comb. 1. R oo. R 2. R. P + oc. Fig. 125. 

 2. R oo. R 2. R. R + oo. P + oo. 



Cleavage, R oo distinct ; R 2 less distinct ; 

 R and P -f- QD traces, not always observable. 

 Fracture conchoidal or uneven. 



Surface smooth, but often rather uneven ; of near- 

 ly the same description in all the forms. 



Lustre vitreous, Colour brownish-red. Streak 

 white. Translucent on the edges ... opake. 



Hardness = 5-0 ... 5-5. Sp. Gr. = 2-898. *f* 



Before the blowpipe it melts into a leek-green scoria. If 

 reduced to powder, it gelatinises with acids. According to 

 STROMEYER, it consists of 



Silica 52-00. 



Zirconia 10-89. 



Lime 10-14. 



Soda 13-92. 



Oxide of Iron 6-85. 



Oxide of Manganese 2-57. 



Muriatic Acid 1-03. 



This angle has been found by Mr LEVY = 73 40". Edinb. 

 Phil. Journ. Vol. XII. p. 81. H. 



