245 



730. HEMATITE. (Red Iron Ore, Red Oxide of Iron.) 



a. Crystallized, having a metallic lustre. Four specimens. 



(Specular Iron Ore.) 



b. In concretions, having a radiated structure. (Compact 



Columnar Haematite.) 

 Ditto, from Pentuan. 



d. Ditto, stratified with red ochre on the surface. 

 Note. Hicmatito consists of anhydrous ferric oxide. See Dana, 

 Mineralogy, p. 140. Specimen a contains 68-77 of metallic iron. It is 

 mixed with crystals of smoky quartz. 



731. GOTHITE. (Brown Haematite, Brown Iron Stone.) 



a. In acicular crystals on quartz. (Needle Iron Stone.) 

 Note. See Dana, Mineralogy, p. 169. 



732. LIMONITK. (Brown Haematite, Brown Ochre.) 



a. Massive, with a fibrous structure. 

 /'. Stalactitic. 



c. Mammillary. 



Note. Limonite consists chiefly of hydrated ferric oxide. See Dana, 

 Mineralogy, p. 172. 



733. MARCASITE. (Radiated Pyrites, Prismatic Iron Pyrites, Cocks- 



comb, Spear, and Cellular Pyrites.) 

 a. A globular specimen. 



Note. This mineral is very liable to decomposition in damp air. It 

 is a sulphide of iron. See Dana, Mineralogy, p. 175. 



734. PYRITE. (Iron Pyrites, Mundic, BisuJphuret of Iron.) 



a. A distinct cubical crystal. 



b. Crystallized. 



Xutc. Some very perfect crystals of this mineral will be found among 

 the specimens illustrating crystalline form in Case No. 9. For fig. of the 

 crystals, see Dana, Mineralogy, p. 63. 



735. CAST IRON. 



a. Containing titanium. 



Note. This specimen was made from the black sand of South Aus- 

 tralia. It was presented by Mr. Percy Wells. 



NICKEL. 



736. KITFERXICKEL. (Niccolite, Arsenical Nickel.) 



a. Crystalline. 



Note. This mineral contains arseuate of nickel, with traces of iron and 

 sulphur. See Dana, Mineralogy, p. 60. 



737. METALLIC NICKEL. 



a. Crude. 



6. Refined. Four specimens. 



Notf. One of the specimens of b has been hammered, to show the 

 malleability of the metal. 



