1899.] Mr. T. H. Holland — Mica-hearing Pegmatites. 85 



serving the purpose of the present Memoir, will be particularly useful as 

 illustrating liis commentated translation of Kalhana's Kasmlr Chronicle, 

 now in course of publication by Messrs. Constable & Co., London. 



4. On Svalpaksara Prajndparamitd. — Bj/Mahamahopadhyaya Hara- 



PRASAD ShASTRI, M.A. 



The papers will be published in the Journal, Part I. 



5. Note on the Mica-heari^ig Pegmatites of Peninsular India. — By 

 Thomas H. Holland, Geological Survey of India. 



The term pegmatite, first suggested in 1822 by the famous French 

 mineralogist Haiiy for the regular intergrowths of quartz and felspar 

 now known as graphic granite, was subsequently extended by Delesse 

 to include all very coarse-grained granites — the " giant " granites 

 {Biiesengranit) of the Germans. Through the teaching of Naumann this 

 use of the word pegmatite has come into general use. Recently, how- 

 ever, it has been employed by Brogger and the late Gr. H. Williams in 

 a more general sense for the coarse-grained equivalents of the other 

 plutonic groups, syenite, diorite and gabbro, and a distinction is made 

 between gyauite- pegmatite, diorite-pegmatite and gabbro-pegmatite. 



The particular form of pegmatite which is so remarkably developed 

 in peninsular India is the acid variety, or granite-pegmatite — the form 

 which difi^ers from ordinary granite merely in the gigantic size of its 

 constituent crystals. In general, therefore, these pegmatites are com- 

 posed of quartz, felspar and mica, like common granite, but on account 

 of the large size of their crystals, pegmatites have yielded fine speci- 

 mens of the rarer minerals which are not known to occur in ordinary 

 granites, for the reason, probably, that in the latter the crystals are too 

 small for individual recognition and isolation. The following is a list 

 of the minerals which have been detected so far in Indian pegmatites : — ^ 



Albite. . Ilmenite. 



Allanite. Kyanite. 



Amazon stone. Lepidolite. 



Apatite. Leucopyrite. 



Automolite. Magnetite. 



Beryl. Moonstone. 



Biotite. Muscovite. 



Cassiterite. Orthoclase. 



Chrysoberyl. Quartz, pink and white. 



Columbite. Toui'maline, red, blue, 



Corundum. • • green and black. 



Epidote. Torbernite. 



Fluor spar. Triplite. 



Garnet. Uranium ochre. 



