THE OCCURRENCE OF OPAL IN GRANITE NEAR NEW Ross, 

 LUNENBURG COUNTY, N. S. BY HARRY PIERS, 

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



Read 23rd May, 1910. 



On 15th March, 1910, the Provincial Museum received 

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

 burg County, N. S., a prospector whose name is connected 

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

 that interesting district, a small mineral specimen 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 New Ross and Lake' 

 Ramsay, Lunenburg County, 1ST. S. The location is 1^8 mile 

 west of the cross-roads at New Ross, and !*/ mile southeast of 

 the south end of Lake Ramsay, while it is afyout l /4 of a mile 

 south of the Dalhousie Road and about ^$th of a mile east of 

 Larder River. From the cassiterite deposit at John Reeves's, 

 it is \Y* 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 which are met with in that 

 district, and in one of which occurs th e Cassiterite which has 

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

 penetration 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 intrude furthest 

 into the enclosing mass. 



*Piers.-^Occurrence of Tin in Nova Scotia: Trans. K S. Inst. Science, xii, 

 Pt. 3, p. 239. 



(446) 



