lviii Report of the Mineralogical Survey [No. 126*. 



river, opposite to Raeengurh. In all this line, mica slate is the only rock 

 occurring in situ. The dip was observed to be N. W., inclination 

 15°. Several very large fragments of gneiss may be seen near the 

 village of Torbut ; one which I noted, had the dimensions of 50 feet by 

 20 by 10. Whence these have come is not so obvious, for the crests of 

 the range do not bear the serrated outline which is here discriminative 

 of gneiss. Near the Deolora, the type consists almost wholly of mica, 

 very tender, and of a yellowish brown colour. It contains numerous 

 veins of quartz, as this type always does. The new road which has 

 been cut by order of Major Kennedy passes through it, and is covered 

 deep by the highly comminuted debris of this rock, the lightest and 

 most transportable sand that is formed. The annoyance to the tra- 

 veller's eyes in a light breeze is not to be described, while the sun 

 strongly reflected from the lamina of the rock, occasions a glare which 

 is almost as irritating to the eyes, as the subtile powder which is every 

 instant blown into them. 



119. At Seel, the rock is of the arenaceous type, and it contains, 

 disseminated in great abundance, octahedral iron ore in small grains 

 and imperfectly formed crystals. This mineral has a specific gravity 

 of 4.81 ; but as there are some impurities in the specimen I tried, 

 it is probable this determination is too low. The limits of octahe- 

 dral iron ore are 4.8, 5.2, while those of axotomous iron ore, which 

 it in some respects resembles, are 4.4, 4.8. But it is very probable 

 that the true limits of the octahedral species, (magnetic iron ore,) do 

 not descend below 5.0, for all the massive or larger crystallised speci- 

 mens exceed this determination, and that the magnetic iron sand will 

 form a distinct species between the axotomous, (titanic iron,) and the 

 octahedral. 



120. The abundance in which these grains are found, may be judged 

 of by the specific gravity of some of the specimens of the micaceous 

 schist in which they are disseminated. This was found to be 3.45. 

 Taking 2.76 as the specific gravity of pure micaceous schist, and 4.8 

 that of the iron, it may be easily demonstrated that the latter constitut- 

 ed by bulk one-third of the rock, or by weight very nearly one-half. 



121. In ascending from Deohea to the Pass of Chount Kagulla, lead- 

 ing into Poondur, micaceous schist alone is observable, but in general in 

 the coating of debris thick fragments of gneiss occur, and it is probable 



