256 K. JiMBÖ : 



separate crystals have not yet been optically studied ; hut each 

 garnet grain in a microscopic slide of the brown garnet rock 

 is finely zonal in structure, very distinctly double-refracting, and 

 shows division into sectors. 



KuRODAKE in Etchü. — In the garnet rocks of yellow to 

 red- brown colour, are found various garnet crystals either form- 

 ing druses in the rock or imbedded in quartz veins running 

 through it. Optical anomalies of the dodecahedral type are 

 easily observed in many of them. We can distinguish in this 

 locality the following varieties of garnet : 



(1.) Dark-brown crystals attaining 2 cm. in diameter, form- 

 ing aggregates and druses in the garnet rock. 



(2.) Keddish-brown smaller crystals. 



(3.) Yellow-coloured minute crystals (rare). 



(4.) Dirty brownish-black crystals (rare). 



(5.) Brownish-black crystals, always imbedded in quartz. 



Nos. 1-3 are found with dodecahedral as well as icositetra- 

 hedral habit, while No. 4 is in icositetrahedra with small faces 

 of GO O2. Another go O« was found in the dodecahedral crystals 

 of No. 2. No. 5 is always dodecahedral. Sometimes we find 

 No. 1 with a brownish-yellow zone outside. 



Wadatöge in Shinano. — -The dark-red, brilliant garnet 

 crystals are almost black in external appearance, with prevail- 

 ing CO O and smaller faces of :i02, and are less than 2 cm. in 

 diameter. 



Yamanoo in Hitachi. — The brownish-red, much cracked 

 garnet of this locality is in 2O2 with subordinate go Q, and 

 is covered with striations parallel to the edges of combina- 

 tion of these two forms. A simple form of co O is seldom ob- 

 served. Similar garnet crystals are also found in the pegmatite 



