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II. Notes on Minm-alogy. — No. VII. On some Rocks and Mine- 

 rals from Central India, including two new Species, Hislopite 

 and Hunterite. Bi/ the Rev. Samuel Haughton, M.A., 

 F.R.S., Fellow of Trinitij College, and Professor of Geology in 

 the University of Dublin'^. 



Mineralogical description of a series of Rocks collected near Ndg- 



pur, Central India, by the Rev. Messrs. Hislop and Hunter. 

 r"riHE following description of some specimens of rocks of 

 A Central India, brought home by Messrs. Hislop and Hun- 

 ter, and given to me by Mr. Rupert Jones, of the Geological 

 Society of London, may prove of some interest, particularly vi^ith 

 reference to the metamorphic action of water at a high tempera- 

 ture, to which the attention of English geologists has been re- 

 cently called by the valuable paper lately read by Mr. Sorby 

 before the Geological Society of London. 

 No. 1. Radiated concretionary nodule of brown carbonate of 



lime and iron ; contains no magnesia. Locality : Girad. 

 No. 2. Dark green calcareo-micaceo-hornblendic rock ; meta- 

 morphic. Locality : Jambul Ghat, South of Nagpur. 

 No. 3. Coarsely crystalline saccharoid dolomite, with long white 

 crystals of Tremolite, very like some specimens from the Val 

 Tremola, St. Gothardt. Locality : Korhadi. 

 Upon a chemical examination of the calcareous portion of this 

 rock, I found it composed of — 



Carbonate of lime .... 144 parts 

 Carbonate of magnesia ... 89 „ 



giving an atomic proportion of — 



CaO,C02 .... 3-88 4 



MgO,C02 .... 2-13 3 



This rock is therefore a pure dolomite, and resembles in its che- 

 mical composition many of the metamorphic maguesian lime- 

 stones. 



No. 4. Hislopite. — Green calc-spar. Locality : Takli. 



This is a very remarkable mineral ; it presents the crystalline 

 form of calc-spar; its colour is a brilliant grass-green; and it 

 effervesces briskly with weak hydrochloric acid, which dissolves 

 its calcareous portion, leaving a beautiful green siliceous skeleton, 

 similar to those to which M. Alphonse Gages has recently di- 

 rected the attention of geologists. 



* Communicated by the Author, having been read before the Royal 

 Dublin Society in November 1858, in whose Museum most of the rocks and 

 minerals are deposited. 



