50 The Rev. S. Haughton's Notes on Mineralogy. 



Atoms. 



Silica 78-19 grs. 1*717 



Magnesia .... 43*13 „ 2*156'. 



:} 2 .. 



Protoxide of iron . . 15*62 „ 0*434 



136*94 



This analysis would make the earthy matrix, taken as a whole, 

 have the composition of pyroxene, 



3RO,2Si0 3 . 



No. X. Additional Notice of Hislopite and Hunterite. 



I published in the Philosophical Magazine of January 1859, 

 an account of two new minerals, found by the Rev. Messrs. 

 Hislop and Hunter near Nagpur, Central India. Being anxious 

 to obtain additional information respecting the geological mode 

 of occurrence of these minerals, I wrote to Mr. Hislop, who fur- 

 nished me with information respecting them, from which I extract 

 the following particulars. 



Hislopite. — This mineral was found in a small stream which 

 flowed down from a trap-hill at Takli. It was discovered by a 

 servant of Major TTapshaw, an officer of the Madras army. Mr. 

 Hislop believes its position in situ to have been in trap-rock, 

 " probably in the thin stratum of freshwater tertiary which is 

 imbedded in the volcanic rock, which has been dispersed in 

 strings by the effusion, and which, generally speaking, contains 

 a pretty equal proportion of calcareous and siliceous ingredients. " 



Mr. Hislop also forwarded to me a specimen of calc-spar, 

 clouded like plasma with pale greenish streaks of a siliceous 

 mineral, sent to him by Dr. Carter from Bombay. Its chemical 

 examination gave me the following result :— 



Carbonate of lime . . . 97*19 

 Green siliceous mineral . . 2*81 



100-00 



The quantity of colouring mineral was too small for examina- 

 tion, and its per-centage much less than that of the Glauconite 

 which gives its rich green colour to Hislopite, in which mineral 

 17*36 per cent, of Glauconite was found by me. 



Hunterite. — This remarkable mineral was found in situ in a 

 watercourse between Mr. Hislop's house and the city of Nagpur ; 

 " it was broken off a pegmatitic dyke, which, like many others, 

 runs at right angles to the apparent strike of the gneiss which 

 it has penetrated." Mr. Hislop regards this gneiss as metamor- 

 phic ( Mahadewa Sandstone ' (of Oldham), which is probably of 

 the age of the lowest tertiary or highest secondary beds ; it was 



