Dr Turner on two hot Mineral Springs in India. 95 



tie paler, and approaches to apple green. It is slightly trans- 

 lucent on the edges. 



The substance of erinite is brittle; its hardness I found 

 = 4.5... 5.0 of the scale of Mohs ; its specific gravity — 4.043. 



According to the locality attached to the specimens in Mr 

 Allan's cabinet, they are natives of the county of Limerick in 

 Ireland. For the nairie of Erinite, which is here proposed for 

 this mineral, the mineralogical public is indebted to Mr Allan. 

 It unites, what is rarely the case with mineralogical names, the 

 comparatively trite and prosaical allusion to the native coun- 

 try, with the poetical recollection of the characteristic verdure 

 of the " Emerald Isle? 



Erinite is associated with two of the species containing ar- 

 senic acid, and copper, described by Count Bournon, the com- 

 mon arseniate of copper, (prismatic olive-malachite of Mohs,) 

 and the dark-blue arseniate, both of them crystallized and dis- 

 posed between the concentric layers of erinite. 



Notice on the Composition of Erinite. By Dr Turner. 

 I had intended to add an analysis of erinite to the preceding 

 account of its mineralogical characters ; but being desirous to 

 repeat one part of it before publication, I subjoin the following 

 as an approximation. 



Oxide of copper, - 59.44 



Alumina, - - 1.77 



Arsenic acid, - - 33.78 



Water, - - 5.01 



100.00 



Art. XIV. — Analysis of the solid contents of two hot mineral 

 Springs in India. By Edward Turner, M.D. F.R.S.E. 

 and Professor of Chemistry in the University of London.* 

 Communicated by the Author. 



-The saline matter submitted to examination was presented to 

 me for that purpose by Dr Brewster, (who received it from 



* Read at the Royal Society of Edinburgh, March 17. 



