SYNONYMES, AND PRIMARY FORMS. 471 



JENITE ; Ilvaite ; Lievrit. 



crystallised. * A right rhombic prism ; M on M' 3 112*. 

 fibrous radiated, 

 amorphous. 

 Jet, see Coal. 



Igloite, see Lime, carbonate, Arragonite. 

 Illuderite, see Epidote. 

 Ilvaite, see Jeoite. 

 INDIANITE, cleavage parallel to the planes of a prism of 



about 95 15', which is the angle of Silicate of lime. 

 Indicolite, see Tourmaline, blue. 

 Inolite, see Lime, carbonate, stalactitic. 

 Johnite, see Alumine, hydrate. 

 Jolite, see Dichroite. 

 IRIDIUM, native, alloyed with Osmium. A regular hexagonal 



prism. 

 IRON. 



arseniate. A cube, the modifications of which are 

 sometimes defective, and such as might result from 

 the tetrahedron as a primary form, 

 arsenical, see Sulphuret, arsenical, 

 carbonate; Brown spar; Stahlstein. 



crystallised. An obtuse rhomboid', P on P, 107. 

 fibrous. 



the fibres parallel. 



radiating and forming a mammellated 



surface. Spherosiderite. 

 chromate. 



crystallised. A regular octahedron. 

 amorphous, 

 native. 



meteoric ; Aerolite ; Bolide ; Meteorite. 



steel. 



oxidulous; Magnetic. 



crystallised. A regular octahedron. 



fibrous. 



amorphous. 



with oxides of Manganese and Zinc. Frank- 

 linite. This mineral crystallises in regular 

 octahedrons ; and the Manganese and Zinc 

 are probably only accidental mixtures with 

 the Iron, 

 oxide. 



anhydrous. 



crystallised ; Oligiste Iron ; Specular Iron. 

 An acute rhomboid', P o P', 86 10'. 



