DIAMOND MINES OF PANNA 



two feet below the surface, a thin stratum of red ironstone gravel imbedded in 

 ferruginous clay, and vegetable soil, were their only covering ; they differed 

 in no respect from those of Piperita Ghat, they were marly, slaty, slightly 

 micaceous, interstratified with thin laminae of sandstone, and associated 

 with calcareous slates, which were dendritic between their partings, and al- 

 though their general colour was bluish green, or greenish grey , yet there was 

 a sufficient mixture of red to characterize thern ; they were about twelve feet 

 thick, and immediately below them was the rocky matrix of the diamond. 



The conglomerate is here as at Brijpur, a gritstone containing peb- 

 bles of quartz, both white and *green, jasper, hornstone, lydianstone, &c., 

 and it is worthy of remark that when the green quartz pebbles abound, it 

 is considered a good sign, and so also when the gritstone is slightly fer- 

 ruginous, the matrix in there mines reposes on compact sandstone, 



Panna Mines. 



The mines of Panna are of the same kind : here also the stratum 

 beneath the vegetable soil is red ironstone gravel, below which are beds of 

 slaty marl, better characterized if possible than those of Kamariya, then 

 follows the f diamond matrix, which differs in no other respect from that 

 of Kamariya or JSrijpur, except that it appears to contain a little more 



ferruginous 



* The green quartz is exceedingly brittle and splintery, the natives call it Kdnchiya, or glassy. 



\ It is worthy of remark that both this matrix and that of Kamariya inclose fragments of 

 schist, which M. Charpentier calls schiste argilleux terreux jaimdtre (see his Essai sur les Pyrenees, 

 page 297.) I have seen this rock in situ at Betharam, at the entrance of the valley of Barej, a 

 small specimen of which accompanies this paper, but I have not as yet been able to trace it in 

 situ in India. At Betharam, it is on the summit of a hill, the base of which is formed of Ophite, a 

 rock of the trappean family, so named by M. Palasou — it has also a great resemblance to burnt 

 clay, so named in Wernerian collections of minerals, as for instance in that presented to the Society 

 by the late Dr. Abel. 



