T. H. Holland. 



GEOLOGICAL SURVEY OF INDIA 



Memoirs VoL XXXIV, Pt. a, PI. VII. 



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8 









From a Drawing by T. H. Holland. Lith., Geol. Surv. of India Office 



CRYSTAL OF MUSCOVITE, 



showing the symmetrical disposition of the optic axial plane, 

 percussion - figure and natural pressure - figure. 



Turpunpandla, Nellore district. 



{Natural Size) 



