ORDER v. BHOMBOHEDRAL EUCHLORE-MICA. 179 



LEONH. S. 286. Cuivre arseniate lamelliforme. HAU Y. 

 Traite, T. III. p. 578. TabL comp. p. 90. Cuivre 

 arseniate hexagonal lamelliforme. Traite*, 2de Ed. 

 T. III. p. 509. 

 BROOKE. Ed. Phil. Journ. Vol. VI. p. 132. 



Fundamental form. Rhombohedron. R = 68 45'. 

 Vol. I. Fig. 7. BROOKE. 



a = V22-26. 



Simple forms. R oo (o) ; R (R) ; P + oo. 



Char, of Comb. Rhombohedral. 



Combinations. 1. R QD. R. Fig. 119. Ting- 

 tang, Cornwall. 2. R QD. R. R + oo. 

 Tingtang. 



Cleavage. R QD highly perfect. Traces of R. 

 Fracture conchoidal, scarcely observable. Sur- 

 face, R QD smooth, sometimes striated in tri- 

 angular directions. R often a little uneven. 



Lustre pearly upon R QD, both as faces of cleav- 

 age, and as faces of crystallisation. The faces 

 R possess a lustre intermediate between vitreous 

 and adamantine. Colour emerald-green, grass- 

 green. Streak emerald-green ... apple-green^ 

 rather paler than the colour. Transparent ... 

 translucent. 



Sectile. Hardness = 20. Sp. Gr. = 2-5488, 



BOURNON. 



Compound Varieties. Massive : composition gra- 

 nular of various sizes of individuals j faces of com- 

 position uneven and rough. 



OBSERVATIONS. 



1. According to Mr BTJOOKE, the terminal edge of R is 



