SYNONYMES, AND PRIMARY FORMS. 461 



carbonate.' 

 blue. - 



crystallised. An oblique rhombic prism, P on 



M or M', 91 30 ; M on M', 99. 

 fibrous, 

 compact, 

 earthy, 

 green. Malachite. 



crystallised ; an oblique rhombic prism, 

 P on M or M 7 , 112 52'; M on M', 

 107 20'. All the crystals I have seen 

 are hemitrope. The plane of junction of 

 the reversed halves being parallel to the 

 great diagonal of the prism, 

 fibrous; Atlaserz. 

 compact, 

 epigene, having the form of the crystals of 



blue carbonate, or of red oxide, 

 siliceous ; Achirite ; Dioptase. An obtuse rhomboid, 

 P or P', 126 17', as measured by W. P. 

 on cleavage planes, 

 anhydrous, reddish brown ? massive, 

 hydrate. 



siliceous ; Chrysocolla. 



muriate. 



crystallised. A right rhombic prism, M on M', 

 97 20', as deduced from the measurement of 

 secondary planes ; the primary planes whose 

 positions are indicated by cleavage, not ap- 

 pearing on the crystals. 



arenaceous. Atacamite. Green sand of Peru, 

 native. 



crystallised. A cube. 

 fibrous, 

 laminar, 

 compact. 



combined with Arsenic and Iron ; White copper, 

 oxide. 



black. 



earthy, 

 red. 



crystallised. A regular octahedron. 

 fibrous. 



The longitudinal planes of the fibres are 

 generally those which would result from the 

 replacement of the edges of the base of the 



