168 Journal of the Asiatic Society of Bengal. [June, 1905. 
21. Note on a Decomposition Product of a Peculiar Variety of 
Bundelkhand Gneiss.—By C. A. Strpurrad, B.A., B.Se., LCS. 
During the construction of the Ken Canal, my attention was 
called by the Executive Engineer in charge of the work, to a 
peculiar soft, white, clayey material found in the low hill on and 
around which the village of Deora-Bhapatptr in the Ajaigarh 
State is built. The hill is one of the low gneissic hills charac- 
teristic of this part of Bundelkhand (vide Medlicott and Bland- 
ford’s ‘Geology of India, Volume I, page 11, et. seg.); but 
appears to be of a somewhat unusual variety of gneiss and one 
more than usually liable to decomposition. At several places on 
the sides of this hill, all about half-way up, small pits have been 
dug into it, and a white clayey material found, which is locally 
used as “‘ white wash.” The same material has been found about 
15 miles south of this in the course of excavating a deep cutting 
(up to 50 feet deep) for the canal. Both positions are within three 
or four miles of the head works of the canal, and some ten miles 
west by south of Ajaigarh town; they are about eight miles north- 
west from the Vindhyan scarp. 
I accordingly obtained some samples and sent them to my 
brother, Dr. O. J. Silberrad, Ph.D., Research Chemist to the War 
Office Explosives Committee, who examined them, and through the 
kindness of a friend had them tested at a pottery as regards the 
suitability of the clay for the manufacture of earthenware or 
other pottery. To them I am indebted for all the following in- 
formation :—- 
The report is subjoined. Beside the figures showing the re- 
sults of the chemical analysis, I have added those of Pinite as 
given in Dana’s Mineralogy, which appears to be a somewhat 
similar material. The occurrence of Titanic Acid in the clay is, 
however, of interest. 
““ Report on Clay from Deora-Bhapatpir. 
Analysis of clay is as follows :— 
Clay from 
Deora-Bhapatpur. Pinite. 
Silica :e, SiO, 44°40°/, 49°11 
Alumina sank: AO. 30°47 29-00 
Lime at CaO ‘61 ‘51 
Magnesia a MgO 2°89 1:07 
Ferric Oxide 7d epeme@s 6°17 913 
Potash call K,O 8:05 6:84 
Soda Ai NaO, ot ‘42 
Titanic Acid ae TiO, 0-54: He 
Combined water and ...... 
organic matter... 6:14 : 4-01 
Moisture i eee 1:10 
Phosphoric Acid ... P.O, 091 
Ay eee 100:461 100-09 
