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XIX. Description and Analysis of a new Specks of 

 Lead-Ore from India, 



Bj Thomas Thomson, M. D. F. R. S. L. & E. F. L. S. 



Fellow of the Geological Society, of the Wernerian 

 Society, and of the Imperial Chirurgo-Medical Aca*. 

 demy of Petersburgh. 



(Read 12th February 1814.^ 



The ore which constitutes the subject of this 

 paper, was brought by Dr Heyne from Madras, 

 where it is sold in the shops for medical purposes. 

 He thinks it probable that it comes originally 

 from Malacca, or the Island of Sumatra. As it: 

 differs in its constituents from every species of orp 

 hitherto observed in Europe, it will not be amiss 

 to lay a description of it, together with the result 

 of its analysis, before the public. 



The external colour of the specimen which I 

 examined, was blackish-blue, with green stains 

 here and there, indicating very clearly, the pre- 

 sence of copper. When broken, it exhibits the 



