VEIN MINERALS. 225 



rarely in the topaz-fluorite rock. Owing to the broken nature 

 of the country rock, close timbering was essential in the small mine 

 openings which had been made, and we were not able as a consequence 

 to make as thorough an examination of this interesting occurrence 

 as we should have liked. 



Beryl, a silicate of aluminum and beryllium, Be 3 Al 2 Si(jOig, 

 has been found in the granite of Sinbo-Sinma in 

 ery ' six sided prisms of a pale greenish colour. 



It has not been found as a vein mineral in Tavoy, but it is common 

 in the wolfram veins of Byingyi in the Yamethin district. It is 

 said to be one of the common minerals in the tungsten deposits of 

 Queensland. Beryl has a hardness of 7-5 to 8 and a specific 

 gravity of about 2*7. It is easily mistaken for apatite, from which 

 it may be distinguished in the field by its superior hardness. 



GENERAL DISTRIBUTION OF WOLFRAM AND CASSITERITE IN 



TAVOY DISTRICT. 



Previous writers have remarked on the zone or belt-like nature 

 of the area over which mineralization is known to have occurred 

 in Tavoy. Thus J. J. A. Page has written : — " The general result 

 of my exploration was that I demonstrated a strip or belt of country 

 running from the west coast at Ileinze Bay down into Mergui district 

 in the vicinity of Tagu or Theindaw, roughly 10J miles wide which 

 I described as tin and wolfram-bearing. Outside this belt I decided 

 that there were but poor chances of either mineral being found in 

 commercially payable proportions. The western margin passes On- 

 hbinkwin, Kanbauk, Egani, Talaingya, Pagaye, Mcke and Tagu. 

 The eastern passes Zinba, Hermyingyi, Myekhanbaw, Wagon, 

 Heinda, Paungdaw, Kyaukton, Theindaw and Thabawleik.'' [J. J. 

 A. Page in K. 0. Beadon (1) ; p. 68.] 



General statements of this nature are liable to be misinterpreted 

 and a more exact definition is called for. In the first place, as we 

 have shown elsewhere, the Tavoyan occurrences aie merely a link 

 in a long chain which stretches from the far north of the Southern 

 Shan States down to the extreme southern point of Tenasserim as 

 far as Burma is concerned, and beyond it, into Siam and the Malay 

 States. Again, the western limit of the Tavoy region is an accidental 



Wnlfenito, molybdate of lead, PbM 4 , has lately boon discovered by Mr. A. W. 

 Ross, Genera] Manager of Hermyingyi, rn that mine, as minute crystals closely 

 resembling those typical of stolzite. 



b2 



