232 K. jiMBö : 



37. Pyrolusite. 



See Psilomelane. 



38. Corundum. 



Takayama ill Mino Province. — From tin placers of this 

 locality were formerly collected flat hexagonal pieces and more 

 columnar grains of blue to bluish-white corundum. Their 

 diameter is less than 1 cm. The parting parallel to oP shows 

 concentric zones and radial stripes of white colour. The 

 different zones are sometimes distinguished by uniaxial and 

 biaxial characters of interference figures. 



39. Hematite. 



The principal hematite localities of Japan have been studied 

 by Otsuka, &c., who determined the extent of the specular iron 

 deposit at Sennin in Rikuchù, Akatani in Echigo, &c. The 

 mineral is found either in massive forms, or as small, flat 

 crystals with rhombohedral and prismatic faces. 



The occurrence of titanic iron, which accompanies magnetic 

 iron sand from different provinces in Japan, has not yet been 

 specially studied. 



40. Cuprite. 



Small cubical, dodecahedral and other simple crystals, less 

 than 0.15 cm. in diameter, are found in cuprite masses, associated 

 with native copper at Kosaka in Kikuchû, Arakawa in Ugo, 

 &c. 



41. Tenorite. 



Ko mentioned small dark-blue six-sided plates, on the black 

 coloured ore (" Kuromono ") of Kosaka in Eikuchû, as being 

 identical with tenorite. 



