SPOJjIA ZEYLANICA. 
189 
NOTES. 
1. Irregularly developed Crystals of Zircon (sp. gr. 4*0) from 
Ceylon,— J. Spencer,M. A., has recently described (Min. Mag., 
voL XIV., No. 63, pp. 43-48 2 1904) some very irregular crystals of 
zircon from gem-bearing gravels forwarded by the Director of the 
Mineralogical Survey. These, together with more usual types, 
are abundant in some of the gemming districts, being derived no 
doubt from granitic rocks of the Balangoda group ; the best 
specimens of the irregular zircons are from the Bambarabotuwa 
valley and Walaweduwa. The specific gravity of the irregular 
crystals varies from 4-0 to over 4*5, the darker coloured crystals 
being less heavy and the lighter coloured more heavy. 
Zircon from Ceylon (Clinographic drawings and 
plans.—L.J.S.). 
The accompanying figures (figs. 2 and 3) are intended to give an 
idea of the shape of two of the crystals, while fig. 1 represents 
an ideally developed crystal with the same forms. The forms 
presentare : a (100), m (110), e (101), p (111), and x (311). A peculiar 
feature presented by almost all the crystals of low specific gravity 
is that on one side they show an area of deeply striated and 
