GEOLOGICAL OCCURRENCE. 37 



the sheet is so curved it is generally much thicker and carries larger 

 sheets of mica than in the thin sheets (fig. 10). From sheets, uniform in 

 thickness over large distances, we find various gradations down to 

 small eye-like lenses, of which many may be found projecting from the 

 schist surface over an area of only a few square yards, giving the 

 impression that the pegmatite magma — the " granitic juice " asZirkel 

 would call it — has thoroughly impregnated the schists. Excellent 

 examples of such occurrences are to be seen near Garanji (Ghorunjee) 

 in the HazaYiMgh district. 



Many of the spaces occupied by the pegmatites are evidently of 

 mechanical origin, the folia of the schists being forced asunder and 

 left wrapping around the pegmatite-eye like the fibres of a piece of 



Fig. ii. Lenticular body of pegmatite with schist folia following its outline. 

 Koderma, Hazdribdgh district. 



timber around a fiat wedge (see fig. u). At the same time this 



explanation is not universally applicable, for we find pegmatite masses 



occupying positions in schists which have suffered no disturbance in 



the direction of their folia, and the pegmatites appear to occupy 



spaces formed by the absorption or removal of the schist material. 



There appears to be no other explanation applicable to stout 



ellipsoids or blunted lenses of the kind illustrated in fig. 12. Such 



occurrences are more characteristic of the larger masses of pegmatite. 



Fig. 12. Pegmatite body in undistubed mica-schist, Gdwan, Hazdribdgh 



district. 



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