The Occurrence of Opal in Graxite near jSTew Ross, 

 Lunenburg County, X. S. — By Harry Piers, 

 Curator of the Provincial Museum, Halifax, X. S. 



Read 23rd May, 1910. 



On IStli March, 1910, the Provincial ]\Iusouin received 

 from Charles Keddy of Lake Ramsay, near New Ross, Lunen- 

 hurii' County, X. S., a prospector whose name is connected 

 with tha discovery in 1906 of tin ore and other minerals in 

 that interesting district, a small mineral speciincn which he 

 desired to have identified (museum accession no. 3538). 



He stated that he had found it in a vein of quartz, about 

 two or three inches wide, cutting mixed red and white granite, 

 on land owned by Amos Gates, between Xew Ross and Lake 

 Ramsay, Lunenburg County, N. S. The location is IH mile 

 west of the cross-roads at New Ross, and 1/^ mile sou,theast of 

 the south end of Lake Ramsay; while it is about J4 of a mile 

 south of the Dalhousie Road and about ^I'sth of a mile east of 

 Larder Rivei*. From the cassiterite deposit at John Retn-'es's, 

 it is iy2 mile east, and about ^ of a mile northeast of the 

 molybdenite occurrence on Larder River. (Vide map of the 

 district marked by Mr. Keddy). 



It is presumed that this quartz-vein, is related to the 

 pegmatite dikes and schlierens wdiich are met with in that 

 district, and in one of which occurs the cassiterite which has 

 been reported on.* It is probable that the vein is the ultimate 

 ])enetration of pegmatitic matter into the granite, as granitic 

 dikes are frequently found to pass at length into quartz alone, 

 the mica and orthoclase constituents having been earlier 

 deposited, thus leaving the acidic remainder to intrnd(> furthest 

 into the enclosing mass. 



•Piers. — Occurrence of Tin in Nova Scotia : Trans. N. S. Inst. Science, xii, 

 pt. 3, p. 239. 



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