Explanation of Plate VII. ( l*li<»t()inicrugTHpiis) 



Figs. 1, 2. Copper-tin ore from t]io Dnisen vein. Ordinary light. Magnified 

 60 diameters. Q, quartz sho\\ ing zonal structure ; S, clialcopyrite ; T, 

 cassiterite in aggregate of minute crystals ; To, topaz. 



Fig. 3. Cassiterite-bearing veinlet cutting the wall-rock of the Daisen vein. 

 Ordinary light. Magnified 50 diameters. SI, more or less silicified slate ; 

 T, cassiterite; Q, quartz; C, chlorite; 8, siderite veinlet; M, muscovite. 



Fig. 4. Quartz veinlet in the wall-rock of the Daisen vein. Ordinary light. 

 Magnified 50 diameters. Q, quartz ; 1', pyrite filling the interstices be- 

 tween quartz crystals ; 8, siderite veinlet cutting the quartz veinlet ; 81, 

 chloritized slate. 



Fig. 5. Wolframite-cassiterite ore from the Dai^^en vein. Ordinary light. 

 Magnified 50 diameters. Q, (piartz ; \V, wolframite; T, cassiterite 

 crystal ; VV^', alteration-product (jf wolframite (sclieelitej. 



