exevi Proceedings of the Asiatic Society of Bengal. [N.S., XV, 
in the same activity. In this paper, the authors limit their observations 
to geological and pomrdlogion, data and give a general idea of the situa- 
tion, characteristics, and mineral associations, of the wolfram and cas- 
siter’ They odes 
They sho ow that all the wolfram vam ae lodes in Burma are 
of the Tenasserim Division. s of tungsten 
tin, which are such resided singer minerals in the pa a teeta with 
al yee st agi unquestionably been introduced from the granitic 
Some of the sources of these ores are pegmatites and greisens, 
pa this fact is S held to give a clue to the presence of the same minerals in 
true quartz lodes of the ordinary type. 
hilst the detrital or alluvial deposits occurring on hill slopes 
adjacent t ak parent lodes may carry both wolfram and cassiterite, the 
ule 
true aBeviad et: as a ru . rry cassiterite only, wolfram being 
found only when tightly enclosed in a matrix of quartz. This is due to 
the perfect cleavage of the wolfram resulting in its ready disintegration 
on m : oduction of a comminuted form eminently suited 
ion. 
n different parts of Burma the ak pig oe of the ores is not 
pe same. “es as only been found at Byingyi in the Yamethin dis- 
in 
a and 
upper Nestea zone a the cieciviag portions of the granite itself. 
Some saussurite boulders from aycuaae study in 
saussuritisation —By D. N. Wap 
e writer describes a number of snow-white boulders of saussurite, 
o- 
duaved’ from the amorphism an original coarse gabbro (euph 
tide). The chemical and microscopic study of these boulde reveals an 
ng series of mineral changes, commencing with the scapolitisa- 
tion of t rse felspar phenocrysts into meionite (sp, gr 2°74), the 
alteration of this to a d cryptocrystalline zoisite aggregate (saus- 
surite), (sp. gr. 3-0), which in sam is observed to change completely into 
grossularite (sp. gr. tena tees mate product in this series of altera- 
tions is a dense, compact ‘chests rock, composed = lly of garnet 
with subordinate inclusions of epidote (elinozois isite) and . ee 
hornblende. The stages in the alteratio: ah the typical» emeceegt 
products formed, as well as the tra nsitional « ro - se tet 
in the ctr and m intel ferric 
minerals of the original gabbro (dialog ess ethop si ananged to 
uralite, thence to serpentine and bastite oge 
